[PATCH] R600/SI: Add preliminary support for flat address space

[Matt Arsenault]

This currently still breaks some tests, and I don't know if it will actually run, but it should at least work as an example for lowering addrspacecast.

http://llvm-reviews.chandlerc.com/D2707

Files:
  lib/Target/R600/AMDGPU.h
  lib/Target/R600/AMDGPU.td
  lib/Target/R600/AMDGPUAsmPrinter.cpp
  lib/Target/R600/AMDGPUAsmPrinter.h
  lib/Target/R600/AMDGPUISelDAGToDAG.cpp
  lib/Target/R600/AMDGPUInstrInfo.h
  lib/Target/R600/AMDGPUInstructions.td
  lib/Target/R600/AMDGPUMachineFunction.cpp
  lib/Target/R600/AMDGPUMachineFunction.h
  lib/Target/R600/AMDGPUSubtarget.cpp
  lib/Target/R600/AMDGPUSubtarget.h
  lib/Target/R600/AMDGPUTargetMachine.cpp
  lib/Target/R600/AMDILInstrInfo.td
  lib/Target/R600/SIInstrFormats.td
  lib/Target/R600/SIInstrInfo.cpp
  lib/Target/R600/SIInstrInfo.td
  lib/Target/R600/SIInstructions.td
  lib/Target/R600/SILowerControlFlow.cpp
  lib/Target/R600/SIRegisterInfo.td
  test/CodeGen/R600/flat-address-space.ll
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