Revert r194247 conditional on non-MSVC.
Revert r194247 conditional on non-MSVC.

These definitions are required by the standard.  MSVC rejecting them
appears to be a bug.

git-svn-id: a34e9779ed74578ad5922b3306b3d80a0c825546@194252 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra