[PATCH] R600/SI: Use DS offsets for constant addresses

[Matt Arsenault]

Use 0 as the base address for a constant address, so if
we have a constant address we can save moves and form
read2/write2s.

http://reviews.llvm.org/D5737

Files:
  lib/Target/R600/AMDGPUISelDAGToDAG.cpp
  test/CodeGen/R600/ds_read2.ll
  test/CodeGen/R600/ds_write2.ll
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