[PATCH] [msan] Unpoison siginfo_t and ucontext_t in signal handlers.

[Evgeniy Stepanov]

  quick fix: use sa_siginfo flag to figure out if the second and the third argument of the handler are valid.

Hi samsonov,

http://llvm-reviews.chandlerc.com/D611

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D611?vs=1477&id=1478#toc

Files:
  lib/sanitizer_common/sanitizer_platform_limits_posix.cc
  lib/sanitizer_common/sanitizer_platform_limits_posix.h
  lib/msan/tests/msan_test.cc
  lib/msan/msan_interceptors.cc
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