[PATCH] tsan: properly instrument unaligned accesses

[Dmitry Vyukov]

Hi kcc, samsonov,

If a memory access is unaligned, emit __tsan_unaligned_read/write callbacks instead of __tsan_read/write.
Required to change semantics of __tsan_unaligned_read/write to not do the user memory. But since they were unused (other than through __sanitizer_unaligned_load/store) this is fine.
Fixes long standing issue 17:
https://code.google.com/p/thread-sanitizer/issues/detail?id=17

http://reviews.llvm.org/D7053

Files:
  lib/Transforms/Instrumentation/ThreadSanitizer.cpp
  lib/tsan/rtl/tsan_interface.cc
  lib/tsan/rtl/tsan_interface.h
  test/Instrumentation/ThreadSanitizer/unaligned.ll
  test/tsan/aligned_vs_unaligned_race.cc
  test/tsan/unaligned_norace.cc

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