[clang] [llvm] [clang][CodeGen] Generate follow-up metadata for loops in correct format (PR #131985)

[Ryotaro Kasuga via cfe-commits]

================
@@ -170,11 +161,10 @@ LoopInfo::createUnrollAndJamMetadata(const LoopAttributes 
&Attrs,
       MDNode::get(Ctx, MDString::get(Ctx, 
"llvm.loop.unroll_and_jam.disable")));
 
   bool FollowupHasTransforms = false;
-  MDNode *Followup = createPartialUnrollMetadata(Attrs, FollowupLoopProperties,
-                                                 FollowupHasTransforms);
+  SmallVector<Metadata *, 4> Followup = createPartialUnrollMetadata(
+      Attrs, FollowupLoopProperties, FollowupHasTransforms);
 
   SmallVector<Metadata *, 4> Args;
-  Args.push_back(nullptr);
----------------
kasuga-fj wrote:

`nullptr` is used as a placeholder for LoopID, so this is no longer necessary, 
right?

https://github.com/llvm/llvm-project/pull/131985
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