[PATCH] [UBSAN] Suppress an error report with given type information

[Byoungyoung Lee]

Hi samsonov, rsmith,

For UBSan vptr, suppress an error report with given type information.

The suppression list is provided with the file (UBSAN_OPTIONS=suppressions=SUPP_FILENAME), and an error report is suppressed if the type of an actual object is in the suppression list.

http://reviews.llvm.org/D4702

Files:
  lib/sanitizer_common/sanitizer_suppressions.cc
  lib/sanitizer_common/sanitizer_suppressions.h
  lib/sanitizer_common/tests/sanitizer_suppressions_test.cc
  lib/ubsan/ubsan_flags.cc
  lib/ubsan/ubsan_flags.h
  lib/ubsan/ubsan_handlers_cxx.cc
  lib/ubsan/ubsan_init.cc
  test/ubsan/TestCases/TypeCheck/vptr.cpp
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