[PATCH] add the -mrecip driver flag and process its options

[Sanjay Patel]

Patch updated:

1. Changed to error out on duplicate argument settings to the -mrecip option; eg: -mrecip=divf,divf
2. Improved variable names
3. Changed refinement step token to ':' (this just looks better than '.' IMO)
4. Fixed logic bug when parsing optional refinement step arg; was allowing correct prefix with bogus suffix ('divffoo') to get through


http://reviews.llvm.org/D8989

Files:
  include/clang/Basic/TargetOptions.h
  include/clang/Driver/Options.td
  lib/CodeGen/BackendUtil.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/Driver/mrecip.c

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