AMDGPU: rename OpenCL lowering pass to be R600 specific.

[airlied]

Summary

This pass is
  a) broken.
  b) r600 specific.
  
  Fixing (a) is a bit more non-trivial, but fixing (b)
  is easy. Move this pass to being R600 only for now.
  
  This pass does pass all the unit tests, however clang
  no longer generates code that looks like the unit test
  input, so fixing the pass requires fixing the tests and
  the pass as one, and checking it works with clang still.

[jvesely]

LGTM

[arsenm]

r332196

lib/Target/AMDGPU/AMDGPU.h

   TargetMachine *TM = nullptr,
   CodeGenOpt::Level OptLevel = CodeGenOpt::Default);
 ModulePass *createAMDGPUAlwaysInlinePass(bool GlobalOpt = true);
-ModulePass *createAMDGPUOpenCLImageTypeLoweringPass();
+ModulePass *createR600OpenCLImageTypeLoweringPass();
 FunctionPass *createAMDGPUAnnotateUniformValues();
 
 ModulePass* createAMDGPUUnifyMetadataPass();

lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

   }
 
   // Handle uses of OpenCL image2d_t, image3d_t and sampler_t arguments.
-  addPass(createAMDGPUOpenCLImageTypeLoweringPass());
+  if (TM.getTargetTriple().getArch() == Triple::r600)
+    addPass(createR600OpenCLImageTypeLoweringPass());
 
   // Replace OpenCL enqueued block function pointers with global variables.
   addPass(createAMDGPUOpenCLEnqueuedBlockLoweringPass());

lib/Target/AMDGPU/CMakeLists.txt

   AMDGPUMacroFusion.cpp
   AMDGPUMCInstLower.cpp
   AMDGPUOpenCLEnqueuedBlockLowering.cpp
-  AMDGPUOpenCLImageTypeLoweringPass.cpp
   AMDGPUPromoteAlloca.cpp
   AMDGPURegAsmNames.inc.cpp
   AMDGPURegisterBankInfo.cpp

   R600ISelLowering.cpp
   R600MachineFunctionInfo.cpp
   R600MachineScheduler.cpp
+  R600OpenCLImageTypeLoweringPass.cpp
   R600OptimizeVectorRegisters.cpp
   R600Packetizer.cpp
   R600RegisterInfo.cpp

lib/Target/AMDGPU/R600OpenCLImageTypeLoweringPass.cpp

-//===- AMDGPUOpenCLImageTypeLoweringPass.cpp ------------------------------===//
+//===- R600OpenCLImageTypeLoweringPass.cpp ------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

 
 namespace {
 
-class AMDGPUOpenCLImageTypeLoweringPass : public ModulePass {
+class R600OpenCLImageTypeLoweringPass : public ModulePass {
   static char ID;
 
   LLVMContext *Context;

   }
 
 public:
-  AMDGPUOpenCLImageTypeLoweringPass() : ModulePass(ID) {}
+  R600OpenCLImageTypeLoweringPass() : ModulePass(ID) {}
 
   bool runOnModule(Module &M) override {
     Context = &M.getContext();

   }
 
   StringRef getPassName() const override {
-    return "AMDGPU OpenCL Image Type Pass";
+    return "R600 OpenCL Image Type Pass";
   }
 };
 
 } // end anonymous namespace
 
-char AMDGPUOpenCLImageTypeLoweringPass::ID = 0;
+char R600OpenCLImageTypeLoweringPass::ID = 0;
 
-ModulePass *llvm::createAMDGPUOpenCLImageTypeLoweringPass() {
-  return new AMDGPUOpenCLImageTypeLoweringPass();
+ModulePass *llvm::createR600OpenCLImageTypeLoweringPass() {
+  return new R600OpenCLImageTypeLoweringPass();
 }