Patch from GM to make more implicit bools explicit since we can't stop MSVC warning about this in headers and to warn is the MSVC default. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@192548 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed