[PATCH] SanitizerArgs: add ability to filter/diagnose unsupported sanitizers.

[Peter Collingbourne]

    - Avoid diagnosing unsupported sanitizers which are added then removed

Hi samsonov, rsmith,

http://llvm-reviews.chandlerc.com/D1990

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1990?vs=5139&id=5142#toc

Files:
  include/clang/Driver/Driver.h
  include/clang/Driver/SanitizerArgs.h
  include/clang/Driver/ToolChain.h
  lib/Driver/Driver.cpp
  lib/Driver/SanitizerArgs.cpp
  lib/Driver/ToolChain.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  test/Driver/fsanitize.c
  test/Driver/tsan.c
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