Fix bug 20740 - std::set/std::map don't support heterogeneous lookup for count(). Thanks to Jim Porter for the bug report

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@216353 91177308-0d34-0410-b5e6-96231b3b80d8
Merge branch 'master' of http://llvm.org/git/libcxx
Replace 'noexcept' with '_NOEXCEPT' in <shared_mutex>. This allows us to build the dylib with MSVC, which doesn't support noexcept (sheesh\!). Thanks to K-ballo for the report.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@216384 91177308-0d34-0410-b5e6-96231b3b80d8
[libcxx] Fix ctype_byname<wchar_t>::do_is() mask checking.

This patch: http://reviews.llvm.org/D5081
Original patch: http://reviews.llvm.org/D5071 (from @danalbert)


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@216497 91177308-0d34-0410-b5e6-96231b3b80d8
Merge branch 'master' of http://llvm.org/git/libcxx
Merge branch 'master' into abi-script