[llvm] [VectorUtils] Add helper to get list of metadata to propagate (NFC). (PR #135003)

[Alexey Bataev via llvm-commits]

================
@@ -984,19 +984,38 @@ MDNode *llvm::intersectAccessGroups(const Instruction *Inst1,
   return MDNode::get(Ctx, Intersection);
 }
 
+/// Add metadata from \p Inst to \p Metadata, if it can be preserved after
+/// vectorization.
+static void getMetadataToPropagate(
+    Instruction *Inst,
+    SmallVectorImpl<std::pair<unsigned, MDNode *>> &Metadata) {
+  Inst->getAllMetadataOtherThanDebugLoc(Metadata);
+  unsigned SupportedIDs[] = {
+      LLVMContext::MD_tbaa,         LLVMContext::MD_alias_scope,
+      LLVMContext::MD_noalias,      LLVMContext::MD_fpmath,
+      LLVMContext::MD_nontemporal,  LLVMContext::MD_invariant_load,
+      LLVMContext::MD_access_group, LLVMContext::MD_mmra};
+
+  // Remove any unsupported metadata kinds from Metadata.
+  for (unsigned Idx = 0; Idx != Metadata.size();) {
+    if (is_contained(SupportedIDs, Metadata[Idx].first))
+      Idx++;
+    else {
----------------
alexey-bataev wrote:

```
    if (is_contained(SupportedIDs, Metadata[Idx].first)) {
      Idx++;
    } else {
```

https://github.com/llvm/llvm-project/pull/135003