[PATCH] R600: Add dag combine for copy of an illegal type.

[Matt Arsenault]

This helps avoid redundant instructions to unpack, and repack
the vectors. Ideally we could recognize that pattern and eliminate
it. Currently v4i8 and other small element type vectors are scalarized,
so this has the added bonus of avoiding that. This helps some image benchmarks.

http://reviews.llvm.org/D4344

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  test/CodeGen/R600/copy-illegal-type.ll
  test/CodeGen/R600/indirect-private-64.ll
  test/CodeGen/R600/load.ll
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