Check in generated CMake files

Once the GitHub action is fixed, these will be auto-updated whenever
necessary. I realized it would be a good idea to add them back first,
though, just to make sure nothing breaks before we enable the
auto-updating.
diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
new file mode 100644
index 0000000..9e0b533
--- /dev/null
+++ b/cmake/CMakeLists.txt
@@ -0,0 +1,311 @@
+# This file was generated from BUILD using tools/make_cmakelists.py.
+
+cmake_minimum_required(VERSION 3.1)
+
+if(${CMAKE_VERSION} VERSION_LESS 3.12)
+    cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
+else()
+    cmake_policy(VERSION 3.12)
+endif()
+
+cmake_minimum_required (VERSION 3.0)
+cmake_policy(SET CMP0048 NEW)
+
+project(upb)
+set(CMAKE_C_STANDARD 99)
+
+
+# Prevent CMake from setting -rdynamic on Linux (!!).
+SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
+SET(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")
+
+# Set default build type.
+if(NOT CMAKE_BUILD_TYPE)
+  message(STATUS "Setting build type to 'RelWithDebInfo' as none was specified.")
+  set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
+      "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
+      FORCE)
+endif()
+
+# When using Ninja, compiler output won't be colorized without this.
+include(CheckCXXCompilerFlag)
+CHECK_CXX_COMPILER_FLAG(-fdiagnostics-color=always SUPPORTS_COLOR_ALWAYS)
+if(SUPPORTS_COLOR_ALWAYS)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdiagnostics-color=always")
+endif()
+
+# Implement ASAN/UBSAN options
+if(UPB_ENABLE_ASAN)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address")
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address")
+  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -fsanitize=address")
+endif()
+
+if(UPB_ENABLE_UBSAN)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address")
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address")
+  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -fsanitize=address")
+endif()
+
+include_directories(..)
+include_directories(../cmake)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+if(APPLE)
+  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -undefined dynamic_lookup -flat_namespace")
+elseif(UNIX)
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--build-id")
+endif()
+
+enable_testing()
+
+add_library(port INTERFACE)
+add_library(upb
+  ../upb/alloc.c
+  ../upb/arena.c
+  ../upb/array.c
+  ../upb/decode.c
+  ../upb/encode.c
+  ../upb/internal/table.h
+  ../upb/internal/unicode.h
+  ../upb/map_sorter.c
+  ../upb/map_sorter.h
+  ../upb/msg.c
+  ../upb/msg_internal.h
+  ../upb/status.c
+  ../upb/upb.c
+  ../upb/alloc.h
+  ../upb/arena.h
+  ../upb/array.h
+  ../upb/decode.h
+  ../upb/encode.h
+  ../upb/extension_registry.h
+  ../upb/message_value.h
+  ../upb/msg.h
+  ../upb/status.h
+  ../upb/string_view.h
+  ../upb/upb.h
+  ../upb/upb.hpp)
+target_link_libraries(upb
+  arena_internal
+  array_internal
+  decode_internal
+  encode_internal
+  extension_registry
+  fastdecode
+  port
+  table_internal
+  unicode_internal)
+add_library(extension_registry
+  ../upb/extension_registry.c
+  ../upb/msg.h
+  ../upb/msg_internal.h
+  ../upb/string_view.h
+  ../upb/upb.h
+  ../upb/extension_registry.h)
+target_link_libraries(extension_registry
+  port
+  table_internal)
+add_library(mini_table_internal INTERFACE)
+target_link_libraries(mini_table_internal INTERFACE
+  extension_registry
+  port
+  table_internal
+  upb)
+add_library(mini_table
+  ../upb/mini_table.c
+  ../upb/mini_table.h
+  ../upb/mini_table.hpp)
+target_link_libraries(mini_table
+  extension_registry
+  mini_table_internal
+  port
+  upb)
+add_library(mini_table_accessors
+  ../upb/internal/mini_table_accessors.h
+  ../upb/mini_table_accessors.c
+  ../upb/mini_table_accessors.h)
+target_link_libraries(mini_table_accessors
+  array_internal
+  collections
+  mini_table
+  mini_table_internal
+  port
+  upb)
+add_library(fastdecode
+  ../upb/decode.h
+  ../upb/decode_fast.c
+  ../upb/decode_fast.h
+  ../upb/msg.h
+  ../upb/msg_internal.h)
+target_link_libraries(fastdecode
+  arena_internal
+  array_internal
+  decode_internal
+  extension_registry
+  port
+  table_internal)
+add_library(generated_code_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me INTERFACE)
+target_link_libraries(generated_code_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me INTERFACE
+  table_internal
+  upb)
+add_library(generated_cpp_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me INTERFACE)
+target_link_libraries(generated_cpp_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me INTERFACE
+  mini_table
+  table_internal
+  upb)
+add_library(generated_reflection_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me INTERFACE)
+target_link_libraries(generated_reflection_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me INTERFACE
+  descriptor_upb_proto
+  reflection
+  reflection_internal
+  table_internal)
+add_library(collections
+  ../upb/map.c
+  ../upb/msg_internal.h
+  ../upb/collections.h
+  ../upb/map.h
+  ../upb/map_sorter.h
+  ../upb/message_value.h)
+target_link_libraries(collections
+  mini_table
+  port
+  table_internal
+  upb)
+add_library(reflection
+  ../upb/reflection/common.h
+  ../upb/reflection/def_builder.c
+  ../upb/reflection/def_builder_internal.h
+  ../upb/reflection/def_pool.c
+  ../upb/reflection/def_pool.h
+  ../upb/reflection/def_pool_internal.h
+  ../upb/reflection/def_type.c
+  ../upb/reflection/def_type.h
+  ../upb/reflection/desc_state.c
+  ../upb/reflection/desc_state_internal.h
+  ../upb/reflection/enum_def.c
+  ../upb/reflection/enum_def.h
+  ../upb/reflection/enum_def_internal.h
+  ../upb/reflection/enum_value_def.c
+  ../upb/reflection/enum_value_def.h
+  ../upb/reflection/enum_value_def_internal.h
+  ../upb/reflection/extension_range.c
+  ../upb/reflection/extension_range.h
+  ../upb/reflection/extension_range_internal.h
+  ../upb/reflection/field_def.c
+  ../upb/reflection/field_def.h
+  ../upb/reflection/field_def_internal.h
+  ../upb/reflection/file_def.c
+  ../upb/reflection/file_def.h
+  ../upb/reflection/file_def_internal.h
+  ../upb/reflection/message.c
+  ../upb/reflection/message_def.c
+  ../upb/reflection/message_def.h
+  ../upb/reflection/message_def_internal.h
+  ../upb/reflection/method_def.c
+  ../upb/reflection/method_def.h
+  ../upb/reflection/method_def_internal.h
+  ../upb/reflection/oneof_def.c
+  ../upb/reflection/oneof_def.h
+  ../upb/reflection/oneof_def_internal.h
+  ../upb/reflection/service_def.c
+  ../upb/reflection/service_def.h
+  ../upb/reflection/service_def_internal.h
+  ../upb/def.h
+  ../upb/def.hpp
+  ../upb/reflection.h
+  ../upb/reflection.hpp
+  ../upb/reflection/def.h
+  ../upb/reflection/def.hpp
+  ../upb/reflection/message.h
+  ../upb/reflection/message.hpp)
+target_link_libraries(reflection
+  collections
+  descriptor_upb_proto
+  mini_table
+  mini_table_internal
+  port
+  table_internal
+  upb)
+add_library(reflection_internal INTERFACE)
+target_link_libraries(reflection_internal INTERFACE
+  collections
+  descriptor_upb_proto
+  mini_table
+  mini_table_internal
+  port
+  reflection
+  table_internal
+  upb)
+add_library(textformat
+  ../upb/text_encode.c
+  ../upb/text_encode.h)
+target_link_libraries(textformat
+  collections
+  encode_internal
+  port
+  reflection)
+add_library(json
+  ../upb/json/decode.c
+  ../upb/json/encode.c
+  ../upb/json/decode.h
+  ../upb/json/encode.h
+  ../upb/json_decode.h
+  ../upb/json_encode.h)
+target_link_libraries(json
+  atoi_internal
+  collections
+  encode_internal
+  port
+  reflection
+  unicode_internal
+  upb)
+add_library(array_internal
+  ../upb/alloc.h
+  ../upb/arena.h
+  ../upb/array.h
+  ../upb/internal/array.c
+  ../upb/message_value.h
+  ../upb/msg.h
+  ../upb/status.h
+  ../upb/string_view.h
+  ../upb/upb.h
+  ../upb/internal/array.h)
+target_link_libraries(array_internal
+  port)
+add_library(arena_internal INTERFACE)
+target_link_libraries(arena_internal INTERFACE
+  port)
+add_library(atoi_internal
+  ../upb/internal/atoi.c
+  ../upb/internal/atoi.h)
+target_link_libraries(atoi_internal
+  port)
+add_library(decode_internal INTERFACE)
+target_link_libraries(decode_internal INTERFACE
+  arena_internal
+  port
+  table_internal
+  /third_party/utf8_range)
+add_library(encode_internal INTERFACE)
+target_link_libraries(encode_internal INTERFACE
+  port)
+add_library(table_internal
+  ../upb/internal/table.c
+  ../upb/alloc.h
+  ../upb/arena.h
+  ../upb/internal/table.h
+  ../upb/status.h
+  ../upb/string_view.h
+  ../upb/upb.h)
+target_link_libraries(table_internal
+  port)
+add_library(unicode_internal
+  ../upb/internal/unicode.c
+  ../upb/internal/unicode.h)
+target_link_libraries(unicode_internal
+  port)
+
+