Override the single object version of operator new with std::nothrow_t in ANGLE's pool allocator

Flutter builds libcxx with exceptions disabled.  Libcxx requires an override of the std::nothrow_t version of operator new if the exception throwing version has been overridden.

See https://github.com/flutter/flutter/pull/180072

Change-Id: I5d4ff641d8ee87679acbd38aadf9ce508a0e3f7f

src/common/PoolAlloc.cpp

diff --git a/src/common/PoolAlloc.cpp b/src/common/PoolAlloc.cpp
index 28e3271..ce887e7 100644
--- a/src/common/PoolAlloc.cpp
+++ b/src/common/PoolAlloc.cpp
@@ -28,8 +28,12 @@
 #    include <sanitizer/asan_interface.h>
 #endif
 
-// Flutter patch - libcxx requires an override of operator new[](size_t, nothrow_t)
-// if operator new[](size_t) has been overridden and exceptions are disabled.
+// Flutter patch - libcxx requires overrides of operator new with
+// std::nothrow_t if operator new has been overridden and exceptions are
+// disabled.
+void* operator new(size_t size, const std::nothrow_t&) noexcept {
+  return ::operator new(size);
+}
 void* operator new[](size_t size, const std::nothrow_t&) noexcept {
   return ::operator new[](size);
 }