Thread safety analysis: make sure that expressions in attributes are parsed
in an unevaluated context.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174644 91177308-0d34-0410-b5e6-96231b3b80d8
Rename -fmodule-cache-path <blah> to -fmodules-cache-path=<blah> for consistency.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174645 91177308-0d34-0410-b5e6-96231b3b80d8