[PATCH] [sanitizer] Support adaptive stack unwinding in sanitizer tools.

[Sergey Matveev]

Hi kcc, glider, samsonov,

Add a new stack unwinding mode which uses the fast unwinder, but
falls back to the slow one if the resulting stack trace appears to be incomplete.

http://llvm-reviews.chandlerc.com/D1378

Files:
  CMakeLists.txt
  lib/asan/asan_interceptors.cc
  lib/asan/asan_rtl.cc
  lib/asan/asan_stack.h
  lib/lsan/lsan.cc
  lib/lsan/lsan_interceptors.cc
  lib/sanitizer_common/sanitizer_flags.cc
  lib/sanitizer_common/sanitizer_flags.h
  lib/sanitizer_common/sanitizer_posix_libcdep.cc
  lib/sanitizer_common/sanitizer_stacktrace.cc
  lib/sanitizer_common/sanitizer_stacktrace.h
  lib/sanitizer_common/sanitizer_win.cc
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