[PATCH] [ASan] Move the SIGSEGV/SIGBUS handling to sanitizer_common

[Alexander Potapenko]

  Introduced the Linux version of internal_sigaction and made InstallDeadlySignalHandlers use it (we don't need any changes to interception/*)

Hi samsonov, kcc,

http://llvm-reviews.chandlerc.com/D2640

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2640?vs=6714&id=6791#toc

Files:
  sanitizer_common/sanitizer_linux.cc
  sanitizer_common/sanitizer_posix_libcdep.cc
  sanitizer_common/sanitizer_win.cc
  sanitizer_common/sanitizer_mac.cc
  sanitizer_common/sanitizer_libc.h
  sanitizer_common/sanitizer_linux_libcdep.cc
  sanitizer_common/sanitizer_common.h
  asan/asan_internal.h
  asan/asan_win.cc
  asan/asan_interceptors.cc
  asan/asan_rtl.cc
  asan/asan_posix.cc
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