[PATCH] Teach the AArch64 backend about half-precision floating point

[Oliver Stannard]

This review now just covers the scalar part of the patch, I will upload a second patch with the vector parts.

Removed most of the type promotions, except for add, sub, mul, div, fp_round and fp_extend.

http://reviews.llvm.org/D4879

Files:
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/fp16-instructions.ll
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