Minor bug fix for allowing an extension of const-qualified types in containers.

llvm-svn: 183481
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 30444adc70a2a7f02d5fd59ef51da5131480dca7
diff --git a/include/memory b/include/memory
index 912a43f..bcf4d6d 100644
--- a/include/memory
+++ b/include/memory
@@ -1750,7 +1750,7 @@
     typedef const _Tp*        const_pointer;
     typedef const _Tp&        reference;
     typedef const _Tp&        const_reference;
-    typedef _Tp               value_type;
+    typedef const _Tp         value_type;
 
     typedef true_type propagate_on_container_move_assignment;