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

[Peter Collingbourne]

Hi samsonov,

The sanitizers whose supported set of platforms I am sure of are now diagnosed
if enabled explicitly on an unsupported platform.  Unsupported sanitizers which
are enabled implicitly (as part of a larger group) are silently disabled.  As a
side effect, this makes SanitizerArgs parsing toolchain-dependent (and thus
essentially reverts r188058), and moves SanitizerArgs ownership to ToolChain.

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

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
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