[PATCH] Make SanitizerArgs parsing toolchain-independent.

[Alexey Samsonov]

Hi rsmith,

This patch moves toolchain-related diagnostics and inspection
of sanitizer arguments later, to the moment we actually produce the
flags that will be passed to the frontend. The final goal is to
move SanitizerArgs to Driver and parse them (reporting the diagnostics)
exactly once.

http://llvm-reviews.chandlerc.com/D1324

Files:
  lib/Driver/SanitizerArgs.cpp
  lib/Driver/SanitizerArgs.h
  lib/Driver/Tools.cpp
  lib/Driver/ToolChains.cpp
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