[PATCH] make reciprocal estimate code generation more flexible by adding command-line options

[Sanjay Patel]

Patch updated:

1. Use '!' to indicate disabled (match change in http://reviews.llvm.org/D8989)
2. Use array of strings as keys to a map instead of enum + loosely-coupled array of recip parameters.


http://reviews.llvm.org/D8982

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/Target/TargetOptions.h
  include/llvm/Target/TargetRecip.h
  lib/Target/CMakeLists.txt
  lib/Target/TargetRecip.cpp
  lib/Target/X86/X86.td
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86Subtarget.cpp
  lib/Target/X86/X86Subtarget.h
  lib/Target/X86/X86TargetMachine.cpp
  test/CodeGen/X86/recip-fastmath.ll
  test/CodeGen/X86/sqrt-fastmath.ll

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