[PATCH] R600/SI: Fix some cases for load / store of half

[Matt Arsenault]

Mostly argument loads were producing broken zextloads from an FP type.

http://reviews.llvm.org/D10168

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/SIISelLowering.cpp
  test/CodeGen/R600/half.ll
  test/CodeGen/R600/trunc-store-f64-to-f16.ll

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