[PATCH] tsan: do not instrument not captured values

[Dmitry Vyukov]

Chandler, I've tested the approach where we ignore only completely non-captured variables, and it seems to give most of the benefit.
Number of __tsan_(read|write|unaligned) calls in webrtc modules_unittest was 240592; with my original patch -- 149078; with only PointerMayBeCaptured -- 149624.

Looks much simpler now as well. And also I don't need to figure out how to reuse DominatorTree from a previous pass :)

PTAL


http://reviews.llvm.org/D7069

Files:
  lib/Transforms/Instrumentation/ThreadSanitizer.cpp
  test/Instrumentation/ThreadSanitizer/capture.ll

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