Band-aid fix for the Windows build caused by r177710. Long-term, atomic_compare_exchange_strong should be a template on Windows too...

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@177745 91177308-0d34-0410-b5e6-96231b3b80d8
Revert 177745 as it was incorrect

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@177746 91177308-0d34-0410-b5e6-96231b3b80d8