tsan: refactor suppressions machinery
The refactoring makes suppressions more flexible
and allow to suppress based on arbitrary number of stacks.
In particular it fixes:
https://code.google.com/p/thread-sanitizer/issues/detail?id=64
"Make it possible to suppress deadlock reports by any stack (not just first)"




git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@209757 91177308-0d34-0410-b5e6-96231b3b80d8