[PATCH] [ASan] Introduce the dump_instruction_bytes flag to print the faulting instruction upon SIGSEGV

[Alexander Potapenko]

Call IsAccessibleMemoryRange() to make sure we don't step on unaccessible memory.
Disable the test on ARM.

http://reviews.llvm.org/D5167

Files:
  lib/asan/asan_flags.h
  lib/asan/asan_report.cc
  lib/asan/asan_rtl.cc
  test/asan/TestCases/dump_instruction_bytes.cc
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