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

[Alexander Potapenko]

Hi samsonov, kcc,

This change is a part of refactoring intended to have common signal handling behavior in all tools.
This particular CL moves InstallSignalHandlers() into sanitizer_common (making it InstallDeadlySignalHandlers()), but doesn't enable default signal handlers for any tool other than ASan.
We now make sanitizer_common tests and clang_rt.san depend on RTInterception on Linux, because InstallDeadlySignalHandlers() needs to call __interception::GetFuncAddr.

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

Files:
  asan/asan_internal.h
  asan/asan_posix.cc
  asan/asan_rtl.cc
  interception/interception.h
  interception/interception_linux.cc
  interception/interception_linux.h
  sanitizer_common/CMakeLists.txt
  sanitizer_common/sanitizer_common.h
  sanitizer_common/sanitizer_linux.cc
  sanitizer_common/sanitizer_mac.cc
  sanitizer_common/sanitizer_posix_libcdep.cc
  sanitizer_common/tests/CMakeLists.txt
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