[llvm] [IR] Allow MDString in operand bundles (PR #110805)

[Paul Walker via llvm-commits]

================
@@ -3202,8 +3202,15 @@ bool LLParser::parseOptionalOperandBundles(
 
       Type *Ty = nullptr;
       Value *Input = nullptr;
-      if (parseType(Ty) || parseValue(Ty, Input, PFS))
+      if (parseType(Ty))
         return true;
+      if (Ty->isMetadataTy()) {
+        if (parseMetadataAsValue(Input, PFS))
+          return true;
+      } else {
+        if (parseValue(Ty, Input, PFS))
+          return true;
+      }
----------------
paulwalker-arm wrote:

This could be just:
```
else if (parseValue(Ty, Input, PFS))
  return true;
```

https://github.com/llvm/llvm-project/pull/110805