[PATCH] [Sanitizer] Add Symbolizer::AddHooks() and use it in TSan and MSan.

[Alexey Samsonov]

Hi eugenis, dvyukov,

TSan and MSan need to know if interceptor was called by the
user code or by the symbolizer and use pre- and post-symbolization hooks
for that. Make Symbolizer class responsible for calling these hooks instead.
This would ensure the hooks are only called when necessary (during
in-process symbolization, they are not needed for out-of-process) and
save specific sanitizers from tracing all places in the code where symbolization
will be performed.

http://llvm-reviews.chandlerc.com/D2067

Files:
  lib/tsan/rtl/tsan_symbolize.cc
  lib/tsan/rtl/tsan_symbolize.h
  lib/tsan/rtl/tsan_rtl.cc
  lib/sanitizer_common/sanitizer_symbolizer.cc
  lib/sanitizer_common/sanitizer_symbolizer.h
  lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
  lib/msan/msan_report.cc
  lib/msan/msan.cc
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