[PATCH] Move SanitizerArgs to the clang Driver

[Alexey Samsonov]

Hi rsmith,

This change turns SanitizerArgs into high-level options
stored in the Driver. Now they are parsed exactly once in
BuildCompilation function. This fixes an issue of multiple copies
of the same diagnostic message produced by sanitizer arguments parser.

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

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