[PATCH] Add target hook to allow merging stores of nonzero constants

[Matt Arsenault]

On GPU targets, materializing constants is cheap and stores are
expensive, so only doing this for zero vectors was silly.
    
Most of the new testcases aren't optimally merged, and are for
later improvements.

http://reviews.llvm.org/D9956

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  test/CodeGen/R600/merge-stores.ll
  test/CodeGen/R600/store.ll

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