[PATCH] Add target hook for whether it is profitable to reduce load widths

[Matt Arsenault]

Add an option to disable optimization to shrink truncated larger type
loads to smaller type loads. On SI this prevents using scalar load
instructions in some cases, since there are no scalar extloads.

http://reviews.llvm.org/D6398

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  test/CodeGen/R600/no-shrink-extloads.ll
  test/CodeGen/R600/store.ll
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