[RemoveDIs] Add additional debug-mode verifier checks (#84308)

Separated from #83251

Author: OCHyams

llvm/lib/IR/Verifier.cpp

@@ -2691,6 +2691,11 @@ void Verifier::visitFunction(const Function &F) {
   Check(verifyAttributeCount(Attrs, FT->getNumParams()),
         "Attribute after last parameter!", &F);
 
+  CheckDI(F.IsNewDbgInfoFormat == F.getParent()->IsNewDbgInfoFormat,
+          "Function debug format should match parent module", &F,
+          F.IsNewDbgInfoFormat, F.getParent(),
+          F.getParent()->IsNewDbgInfoFormat);
+
   bool IsIntrinsic = F.isIntrinsic();
 
   // Check function attributes.
@@ -3034,6 +3039,11 @@ void Verifier::visitBasicBlock(BasicBlock &BB) {
     Check(I.getParent() == &BB, "Instruction has bogus parent pointer!");
   }
 
+  CheckDI(BB.IsNewDbgInfoFormat == BB.getParent()->IsNewDbgInfoFormat,
+          "BB debug format should match parent function", &BB,
+          BB.IsNewDbgInfoFormat, BB.getParent(),
+          BB.getParent()->IsNewDbgInfoFormat);
+
   // Confirm that no issues arise from the debug program.
   if (BB.IsNewDbgInfoFormat)
     CheckDI(!BB.getTrailingDPValues(), "Basic Block has trailing DbgRecords!",