[PATCH] [sanitizer] Move GetStackTrace from ASan to sanitizer_common.

[Sergey Matveev]

    - addressed comments by kcc
    - SANITIZER_CAN_FAST_UNWIND macro

Hi kcc,

http://llvm-reviews.chandlerc.com/D766

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D766?vs=1877&id=1878#toc

Files:
  lib/asan/asan_linux.cc
  lib/asan/asan_mac.cc
  lib/asan/asan_stack.h
  lib/asan/asan_win.cc
  lib/sanitizer_common/sanitizer_posix.cc
  lib/sanitizer_common/sanitizer_stacktrace.h
  lib/sanitizer_common/sanitizer_win.cc
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