[llvm] [MergeFuncs/CFI] Ensure all type metadata is propogated for CFI (PR #88218)

[Nikita Popov via llvm-commits]

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@@ -712,10 +712,13 @@ static bool canCreateThunkFor(Function *F) {
   return true;
 }
 
-/// Copy metadata from one function to another.
-static void copyMetadataIfPresent(Function *From, Function *To, StringRef Key) {
-  if (MDNode *MD = From->getMetadata(Key)) {
-    To->setMetadata(Key, MD);
+/// Copy all metadata of a specific kind from one function to another.
+static void copyMetadataIfPresent(Function *From, Function *To,
+                                  StringRef Kind) {
+  SmallVector<MDNode *, 4> MDs;
+  From->getMetadata(Kind, MDs);
+  for (MDNode *MD : MDs) {
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nikic wrote:

No braces for single-line if.

https://github.com/llvm/llvm-project/pull/88218