[PATCH] Add support for fast-math flags to the FCmp instruction.

[James Molloy]

Hi hfinkel, majnemer, chandlerc,

FCmp behaves a lot like a floating-point binary operator in many ways,
and can benefit from fast-math information. Flags such as nsz and nnan
can affect if this fcmp (in combination with a select) can be treated
as a fminnum/fmaxnum operation.

This adds backwards-compatible bitcode support, IR parsing and writing,
LangRef changes and IRBuilder changes. I'll need to audit InstSimplify
and InstCombine in a followup to find places where flags should be
copied.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9793

Files:
  docs/LangRef.rst
  include/llvm/IR/IRBuilder.h
  include/llvm/IR/Operator.h
  lib/AsmParser/LLParser.cpp
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  test/Bitcode/fcmp-fast.ll
  unittests/IR/IRBuilderTest.cpp

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