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

[Evgeniy Stepanov]

Hi samsonov,

Add wrappers for all user signal handlers that unpoison the handler's arguments.

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

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