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

[Alexander Potapenko]

Hi kcc, eugenis,

When dump_instruction_bytes=1 and the instruction pointer doesn't point to the zero page, ASan prints 16 bytes starting at the instruction point.
When the instruction pointer points to the zero page, print a warning about that.
Also allow deadly signals to be received in signal handlers (previously ASan would just crash upon the second SEGV)

http://reviews.llvm.org/D5167

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