[PATCH] R600/SI: Use same complex patterns for DS atomics

[Matt Arsenault]

This fixes hitting the same negative base offset problem 
that was already fixed for regular loads and stores.

http://reviews.llvm.org/D5203

Files:
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/atomic_cmp_swap_local.ll
  test/CodeGen/R600/local-atomics.ll
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