[PATCH] tsan: implement suppressions for top frame only

[Dmitry Vyukov]

Hi glider,

The new suppression type is called "race_top" and is matched only against top frame in report stacks.
This is required for situations when we want to suppress a race in a "thread pool" or "event loop" implementation.
If we simply use "race:ThreadPool::Execute" suppression, that can suppress everything in the program.

http://reviews.llvm.org/D10686

Files:
  lib/tsan/rtl/tsan_suppressions.cc
  lib/tsan/rtl/tsan_suppressions.h
  test/tsan/race_top_suppression.cc
  test/tsan/race_top_suppression.cc.supp
  test/tsan/race_top_suppression1.cc
  test/tsan/race_top_suppression1.cc.supp

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