[PATCH] R600: Fix mishandling of load / store chains.

[Matt Arsenault]

Fixes various bugs with reordering loads and stores. Scalarized vector loads weren't collecting the chains at all.

http://reviews.llvm.org/D4335

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/SIISelLowering.cpp
  test/CodeGen/R600/reorder-stores.ll
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