[PATCH] [sanitizer] support toolchains that don't understand CFI directives

[Kostya Serebryany]

Hi dvyukov,

Support toolchains that don't understand CFI directives.

http://llvm-reviews.chandlerc.com/D2336

Files:
  lib/tsan/rtl/tsan_rtl_amd64.S
  lib/tsan/rtl/tsan_rtl.h
  lib/sanitizer_common/sanitizer_asm.h
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