Address intermittent ICE triggered from the OpenMPIRBuilder::finalize method due to an invalid builder insertion point

Author: skatrak

mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp

@@ -5872,6 +5872,7 @@ convertOmpTarget(Operation &opInst, llvm::IRBuilderBase &builder,
 
 static LogicalResult
 convertDeclareTargetAttr(Operation *op, mlir::omp::DeclareTargetAttr attribute,
+                         llvm::OpenMPIRBuilder *ompBuilder,
                          LLVM::ModuleTranslation &moduleTranslation) {
   // Amend omp.declare_target by deleting the IR of the outlined functions
   // created for target regions. They cannot be filtered out from MLIR earlier
@@ -5894,6 +5895,11 @@ convertDeclareTargetAttr(Operation *op, mlir::omp::DeclareTargetAttr attribute,
             moduleTranslation.lookupFunction(funcOp.getName());
         llvmFunc->dropAllReferences();
         llvmFunc->eraseFromParent();
+
+        // Invalidate the builder's current insertion point, as it now points to
+        // a deleted block.
+        ompBuilder->Builder.ClearInsertionPoint();
+        ompBuilder->Builder.SetCurrentDebugLocation(llvm::DebugLoc());
       }
     }
     return success();
@@ -6338,9 +6344,12 @@ LogicalResult OpenMPDialectLLVMIRTranslationInterface::amendOperation(
       .Case("omp.declare_target",
             [&](Attribute attr) {
               if (auto declareTargetAttr =
-                      dyn_cast<omp::DeclareTargetAttr>(attr))
+                      dyn_cast<omp::DeclareTargetAttr>(attr)) {
+                llvm::OpenMPIRBuilder *ompBuilder =
+                    moduleTranslation.getOpenMPBuilder();
                 return convertDeclareTargetAttr(op, declareTargetAttr,
-                                                moduleTranslation);
+                                                ompBuilder, moduleTranslation);
+              }
               return failure();
             })
       .Case("omp.requires",