[PATCH] Add support to promote f16 to f32

[Pirama Arumuga Nainar]

Thanks for the review and LGTM, ab.

- Minor changes based on prior comments
- There are a few instances of 'dl' in the softening and expansion routines in the same file.  That can be cleaned up as a separate patch.


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

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