[PATCH] Add support to promote f16 to f32

[Pirama Arumuga Nainar]

- Removed test/Generic to be added at a later time.  Some backends need patches before they can pass these tests.
- Added tests for libcall conversions
- Added insert_vector_elt and extract_vector_elt tests
- Added struct tests (pass-by-value, return-by-value, extractvalue, insertvalue)
- Added CHECKs for half args and returns


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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