Revert "Invalidate the file system cache entries for files that may rebuild"

This reverts commit r209910, which is breaking some of the bots.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209911 91177308-0d34-0410-b5e6-96231b3b80d8
Thread Safety Analysis: fix handling of string and char literals.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209913 91177308-0d34-0410-b5e6-96231b3b80d8