[llvm] [DebugInfo][RemoveDIs][NFC] Split findDbgDeclares into two functions (PR #77478)

[Carlos Alberto Enciso via llvm-commits]

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@@ -44,6 +44,44 @@ using namespace llvm;
 using namespace llvm::at;
 using namespace llvm::dwarf;
 
+TinyPtrVector<DbgDeclareInst *> llvm::findDbgDeclares(Value *V) {
+  // This function is hot. Check whether the value has any metadata to avoid a
+  // DenseMap lookup.
+  if (!V->isUsedByMetadata())
+    return {};
+  auto *L = LocalAsMetadata::getIfExists(V);
+  if (!L)
+    return {};
+  auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L);
+  if (!MDV)
+    return {};
+
+  TinyPtrVector<DbgDeclareInst *> Declares;
+  for (User *U : MDV->users()) {
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CarlosAlbertoEnciso wrote:

The braces in the `for` are not needed.

https://github.com/llvm/llvm-project/pull/77478