[clang] [CIR][AMDGPU] Route printf in device code through the OpenCL runtime (PR #226435)

[via cfe-commits]

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@@ -65,8 +65,12 @@ lowerFromCIRToLLVMIR(mlir::ModuleOp MLIRModule, llvm::LLVMContext &LLVMCtx,
                      bool EnableOpenMP,
                      llvm::StringRef mlirSaveTempsOutFile = {},
                      llvm::vfs::FileSystem *fs = nullptr) {
-  return direct::lowerDirectlyFromCIRToLLVMIR(MLIRModule, LLVMCtx, EnableOpenMP,
-                                              mlirSaveTempsOutFile, fs);
+  std::unique_ptr<llvm::Module> LLVMModule =
+      direct::lowerDirectlyFromCIRToLLVMIR(MLIRModule, LLVMCtx, EnableOpenMP,
+                                           mlirSaveTempsOutFile, fs);
+  if (LLVMModule)
+    direct::expandAMDGPUDevicePrintf(*LLVMModule);
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skc7 wrote:

The expansion is only wired into `CIRGenAction, but `cir-translate` also calls `lowerDirectlyFromCIRToLLVMIR` and would leave an undefined @__cir_amdgpu_printf. Could it run at the end of `lowerDirectlyFromCIRToLLVMIR`?

https://github.com/llvm/llvm-project/pull/226435