[MLIR][Flang][DebugInfo] Convert debug format in MLIR translators

Following from the previous commit, this patch converts to the
appropriate debug info format before printing LLVM IR.

See: #95098

Author: SLTozer

flang/lib/Frontend/FrontendActions.cpp

@@ -1276,6 +1276,7 @@ void CodeGenAction::executeAction() {
   if (action == BackendActionTy::Backend_EmitLL) {
     // When printing LLVM IR, we should convert the module to the debug info
     // format that LLVM expects us to print.
+    // See https://llvm.org/docs/RemoveDIsDebugInfo.html
     llvm::ScopedDbgInfoFormatSetter FormatSetter(*llvmModule,
                                                  WriteNewDbgInfoFormat);
     if (WriteNewDbgInfoFormat)

mlir/lib/Target/LLVMIR/ConvertToLLVMIR.cpp

@@ -16,9 +16,12 @@
 #include "mlir/Target/LLVMIR/Dialect/All.h"
 #include "mlir/Target/LLVMIR/Export.h"
 #include "mlir/Tools/mlir-translate/Translation.h"
+#include "llvm/IR/DebugProgramInstruction.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 
+extern llvm::cl::opt<bool> WriteNewDbgInfoFormat;
+
 using namespace mlir;
 
 namespace mlir {
@@ -31,6 +34,13 @@ void registerToLLVMIRTranslation() {
         if (!llvmModule)
           return failure();
 
+        // When printing LLVM IR, we should convert the module to the debug info
+        // format that LLVM expects us to print.
+        // See https://llvm.org/docs/RemoveDIsDebugInfo.html
+        llvm::ScopedDbgInfoFormatSetter FormatSetter(*llvmModule,
+                                                     WriteNewDbgInfoFormat);
+        if (WriteNewDbgInfoFormat)
+          llvmModule->removeDebugIntrinsicDeclarations();
         llvmModule->print(output, nullptr);
         return success();
       },

mlir/test/lib/Dialect/Test/TestToLLVMIRTranslation.cpp

@@ -22,6 +22,9 @@
 #include "mlir/Tools/mlir-translate/Translation.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/TypeSwitch.h"
+#include "llvm/IR/DebugProgramInstruction.h"
+
+extern llvm::cl::opt<bool> WriteNewDbgInfoFormat;
 
 using namespace mlir;
 
@@ -122,6 +125,13 @@ void registerTestToLLVMIR() {
         if (!llvmModule)
           return failure();
 
+        // When printing LLVM IR, we should convert the module to the debug info
+        // format that LLVM expects us to print.
+        // See https://llvm.org/docs/RemoveDIsDebugInfo.html
+        llvm::ScopedDbgInfoFormatSetter FormatSetter(*llvmModule,
+                                                     WriteNewDbgInfoFormat);
+        if (WriteNewDbgInfoFormat)
+          llvmModule->removeDebugIntrinsicDeclarations();
         llvmModule->print(output, nullptr);
         return success();
       },