[PATCH] tsan: fix signal handling during stop-the-world

[Dmitry Vyukov]

Hi earthdok,

Long story short: stop-the-world briefly resets SIGSEGV handler to SIG_DFL. This breaks programs that handle and continue after SIGSEGV (namely JVM). See the test and comments for details.

http://reviews.llvm.org/D7722

Files:
  lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc
  test/tsan/signal_segv_handler.cc

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