[TableGen] Print Error and not crash on dumping non-string values (#104568)

Co-authored-by: Akshat Oke <[email protected]>

Author: optimisan

llvm/lib/TableGen/Error.cpp

@@ -173,8 +173,11 @@ void CheckAssert(SMLoc Loc, Init *Condition, Init *Message) {
 // Dump a message to stderr.
 void dumpMessage(SMLoc Loc, Init *Message) {
   auto *MessageInit = dyn_cast<StringInit>(Message);
-  assert(MessageInit && "no debug message to print");
-  PrintNote(Loc, MessageInit->getValue());
+  if (!MessageInit) {
+    PrintError(Loc, "dump value is not of type string");
+  } else {
+    PrintNote(Loc, MessageInit->getValue());
+  }
 }
 
 } // end namespace llvm