[clang-tools-extra] [MLIR] Update convert-gpu-to-spirv pass to prepare using GPU compilat… (PR #69941)

[Sang Ik Lee via cfe-commits]

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@@ -54,22 +55,67 @@ void GPUToSPIRVPass::runOnOperation() {
 
   SmallVector<Operation *, 1> gpuModules;
   OpBuilder builder(context);
+
+  auto getTargetEnvFromGPUModuleOp = [*this](gpu::GPUModuleOp moduleOp) {
+    Operation *gpuModule = moduleOp.getOperation();
+    auto targetAttr = spirv::lookupTargetEnvOrDefault(gpuModule);
+    std::unique_ptr<ConversionTarget> target =
+        SPIRVConversionTarget::get(targetAttr);
+
+    SPIRVConversionOptions options;
+    options.use64bitIndex = this->use64bitIndex;
+    SPIRVTypeConverter typeConverter(targetAttr, options);
+    const spirv::TargetEnv &targetEnv = typeConverter.getTargetEnv();
+    return targetEnv;
+  };
+
   module.walk([&](gpu::GPUModuleOp moduleOp) {
     // Clone each GPU kernel module for conversion, given that the GPU
     // launch op still needs the original GPU kernel module.
-    builder.setInsertionPoint(moduleOp.getOperation());
+    // SPIRV module insertion point by is after original GPU module.
+    // This works fine for Vulkan shader that has a dedicated runner.
+    // But OpenCL kernel needs SPIRV module placed inside original GPU module as
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silee2 wrote:

I don't know. My goal was to make no change to existing Vulkan workflow. 

https://github.com/llvm/llvm-project/pull/69941