[TSan] Use Clang to compile and link TSan unit tests with TSan runtime

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@190503 91177308-0d34-0410-b5e6-96231b3b80d8
[Sanitizer] build sanitizer_common library with -Wglobal-constructors

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@190504 91177308-0d34-0410-b5e6-96231b3b80d8