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

[Sanjay Patel]

Patch updated to treat -mrecip as a target-independent flag. Clang just does some simple transforms and error-checking on the input strings and passes them through to the backend. The backend is responsible for further processing and target-specific default settings.


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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