[PATCH] Move SanitizerArgs to the clang Driver

[Alexey Samsonov]

  Parse sanitizer arguments lazily, if a tool needs them. Add a test for this.

Hi rsmith,

http://llvm-reviews.chandlerc.com/D1341

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1341?vs=3319&id=3418#toc

Files:
  include/clang/Driver/ToolChain.h
  include/clang/Driver/SanitizerArgs.h
  include/clang/Driver/Driver.h
  lib/Driver/ToolChain.cpp
  lib/Driver/SanitizerArgs.cpp
  lib/Driver/SanitizerArgs.h
  lib/Driver/Driver.cpp
  lib/Driver/Tools.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  test/Driver/fsanitize.c
  test/Driver/integrated-as.s
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