[PATCH] Add support to promote f16 to f32

[Pirama Arumuga Nainar]

- Removed the command line option and instead enable PromoteFloat on targets where f32 is legal
- Updated LegalizeFloatTypes.cpp covering ab's comments.
- Added a comprehensive test of fp16 promotion to test/Codegen/ARM/fp16-promote.ll


http://reviews.llvm.org/D8755

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
  lib/CodeGen/SelectionDAG/LegalizeTypes.h
  lib/CodeGen/TargetLoweringBase.cpp
  test/CodeGen/ARM/fp16-promote.ll
  test/CodeGen/Generic/fp16-promote.ll

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