[PATCH] [ASan] Make stack-buffer-overflow reports more robust

[Alexey Samsonov]

Hi kcc,

Fix the function that gets stack frame description by address in
thread stack, so that it clearly indicates failures. Make this error non-fatal,
and print as much information as we can in this case. Make all errors in
ParseFrameDescription non-fatal.

http://reviews.llvm.org/D5554

Files:
  lib/asan/asan_debugging.cc
  lib/asan/asan_report.cc
  lib/asan/asan_thread.cc
  lib/asan/asan_thread.h
  lib/sanitizer_common/scripts/sancov_symbolize.sh
  test/asan/TestCases/Linux/init-order-templ.cc
  test/ubsan/TestCases/TypeCheck/vptr-shared.cpp.zzz
  zdesc.allocator
  zdesc.asan
  zdesc.builtins
  zdesc.cmake
  zdesc.d4692
  zdesc.d4703
  zdesc.ext_libcxx
  zdesc.lsan
  zdesc.msan
  zdesc.san
  zdesc.sanitizer
  zdesc.tsan
  zdesc.ubsan
  zdiff.d2178
  zdiff.d4305
  zdiff.d4692
  zdiff.d4703
  zdiff.jakub_ubsan
  zdiff.r209897
  zdiff.ubsan
  zdiff.ubsan-summary
  zdiff.zflags
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