Thread safety analysis: add -Wthread-safety-verbose flag, which adds additional notes that are helpful when compiling statistics on thread safety warnings.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@215677 91177308-0d34-0410-b5e6-96231b3b80d8
Use a switch statement for IsIntegratedAssemblerDefault().


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@215678 91177308-0d34-0410-b5e6-96231b3b80d8