[PATCH] [compiler-rt] bug 23600 - sanitizer stack trace pc off by 1

[Martin Sebor]

Added a new test, test/asan/TestCases/print-stack-trace-pc-on-signal.cc, to verify that the PC printed in stack traces generated in response to a signal matches the PC obtained in the signal handler for frame #0 and the PC returned from __builtin_return_address for frames #1 and beyond.
Removed an incorrect change to GetPreviousInstructionPc for ARM.
Removed unnecessary changes to lit.* files.


http://reviews.llvm.org/D10065

Files:
  lib/sanitizer_common/sanitizer_stacktrace.h
  lib/sanitizer_common/sanitizer_stacktrace_libcdep.cc
  test/asan/TestCases/print-stack-trace-pc-on-signal.cc
  test/sanitizer_common/TestCases/print-stack-trace-pc.cc

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