[PATCH] [UBSan] Add summary reporting

[Alexey Samsonov]

Hi rsmith,

This doesn't modify plain UBSan behavior, but if UBSan is combined
with ASan, it prints the following line:
  SUMMARY: AddressSanitizer: runtime-error: some/file.cc:8
after its usual diagnostics. It is consistent with another error reports
produced by ASan and plays well with __sanitizer_report_error_summary callback
overridable by user.

http://llvm-reviews.chandlerc.com/D2178

Files:
  lib/ubsan/lit_tests/AsanConfig/lit.cfg
  lib/ubsan/lit_tests/TestCases/Integer/summary.cpp
  lib/ubsan/lit_tests/UbsanConfig/lit.cfg
  lib/ubsan/ubsan_handlers.cc
  lib/ubsan/ubsan_handlers_cxx.cc
  lib/ubsan/ubsan_diag.cc
  lib/ubsan/ubsan_diag.h
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