Add static_assert to set/multiset/map/multimap/forward_list/deque that the allocator's value_type match the container's value_type. vector/unordered/list/string already do this. Add tests for all the containers to verify this.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@254119 91177308-0d34-0410-b5e6-96231b3b80d8

include/forward_list

diff --git a/include/forward_list b/include/forward_list
index 8a87fc5..adbc32c 100644
--- a/include/forward_list
+++ b/include/forward_list
@@ -537,6 +537,9 @@
     typedef _Tp    value_type;
     typedef _Alloc allocator_type;
 
+    static_assert((is_same<typename allocator_type::value_type, value_type>::value),
+                  "Allocator::value_type must be same type as value_type");
+
     typedef value_type&                                                reference;
     typedef const value_type&                                          const_reference;
     typedef typename allocator_traits<allocator_type>::pointer         pointer;