[clang] [CIR] Add framework for CIR to LLVM IR lowering (PR #124650)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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git-clang-format --diff 3861b9db882d5637725ceeccb801c2bb837e8fc5 41546e2d096310d8a1474539b5036152c7df3d11 --extensions h,cpp,c -- clang/include/clang/CIR/LowerToLLVM.h clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp clang/test/CIR/Lowering/hello.c clang/include/clang/CIR/CIRGenerator.h clang/include/clang/CIR/FrontendAction/CIRGenAction.h clang/lib/CIR/FrontendAction/CIRGenAction.cpp clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/CIR/LowerToLLVM.h b/clang/include/clang/CIR/LowerToLLVM.h
index 82a28270cc..ee9f70495e 100644
--- a/clang/include/clang/CIR/LowerToLLVM.h
+++ b/clang/include/clang/CIR/LowerToLLVM.h
@@ -28,8 +28,8 @@ class ModuleOp;
 namespace cir {
 
 namespace direct {
-std::unique_ptr<llvm::Module> lowerDirectlyFromCIRToLLVMIR(
-    mlir::ModuleOp M, llvm::LLVMContext &Ctx);
+std::unique_ptr<llvm::Module>
+lowerDirectlyFromCIRToLLVMIR(mlir::ModuleOp M, llvm::LLVMContext &Ctx);
 } // namespace direct
 } // namespace cir
 
diff --git a/clang/lib/CIR/FrontendAction/CIRGenAction.cpp b/clang/lib/CIR/FrontendAction/CIRGenAction.cpp
index 583fd8126e..9101f3cc38 100644
--- a/clang/lib/CIR/FrontendAction/CIRGenAction.cpp
+++ b/clang/lib/CIR/FrontendAction/CIRGenAction.cpp
@@ -7,13 +7,13 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/CIR/FrontendAction/CIRGenAction.h"
+#include "mlir/IR/MLIRContext.h"
+#include "mlir/IR/OwningOpRef.h"
 #include "clang/CIR/CIRGenerator.h"
 #include "clang/CIR/LowerToLLVM.h"
 #include "clang/CodeGen/BackendUtil.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "llvm/IR/Module.h"
-#include "mlir/IR/MLIRContext.h"
-#include "mlir/IR/OwningOpRef.h"
 
 using namespace cir;
 using namespace clang;
@@ -51,8 +51,7 @@ class CIRGenConsumer : public clang::ASTConsumer {
   std::unique_ptr<CIRGenerator> Gen;
 
 public:
-  CIRGenConsumer(CIRGenAction::OutputType Action,
-                 CompilerInstance &CI,
+  CIRGenConsumer(CIRGenAction::OutputType Action, CompilerInstance &CI,
                  std::unique_ptr<raw_pwrite_stream> OS)
       : Action(Action), CI(CI), OutputStream(std::move(OS)),
         FS(&CI.getVirtualFileSystem()),
@@ -88,10 +87,9 @@ public:
                                              std::move(MLIRCtx), LLVMCtx);
 
       BackendAction BEAction = getBackendActionFromOutputType(Action);
-      emitBackendOutput(CI, CI.getCodeGenOpts(),
-                        C.getTargetInfo().getDataLayoutString(),
-                        LLVMModule.get(), BEAction, FS,
-                        std::move(OutputStream));
+      emitBackendOutput(
+          CI, CI.getCodeGenOpts(), C.getTargetInfo().getDataLayoutString(),
+          LLVMModule.get(), BEAction, FS, std::move(OutputStream));
       break;
     }
     }
@@ -125,8 +123,8 @@ CIRGenAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
   if (!Out)
     Out = getOutputStream(CI, InFile, Action);
 
-  auto Result = std::make_unique<cir::CIRGenConsumer>(
-      Action, CI, std::move(Out));
+  auto Result =
+      std::make_unique<cir::CIRGenConsumer>(Action, CI, std::move(Out));
 
   return Result;
 }
diff --git a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
index 4bf0f3ab78..b69e063170 100644
--- a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
+++ b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
@@ -18,7 +18,6 @@
 #include "llvm/IR/Module.h"
 #include "llvm/Support/TimeProfiler.h"
 
-
 using namespace cir;
 using namespace llvm;
 
@@ -30,7 +29,8 @@ lowerDirectlyFromCIRToLLVMIR(mlir::ModuleOp theModule, LLVMContext &llvmCtx) {
   llvm::TimeTraceScope scope("lower from CIR to LLVM directly");
 
   auto ModuleName = theModule.getName();
-  auto llvmModule = std::make_unique<llvm::Module>(ModuleName ? *ModuleName : "CIRToLLVMModule", llvmCtx);
+  auto llvmModule = std::make_unique<llvm::Module>(
+      ModuleName ? *ModuleName : "CIRToLLVMModule", llvmCtx);
 
   if (!llvmModule)
     report_fatal_error("Lowering from LLVMIR dialect to llvm IR failed!");

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https://github.com/llvm/llvm-project/pull/124650