[llvm] [llvm] Add NodeMetadata::optUnsafeEdges (NFC) (PR #137539)

[Jakub Kuderski via llvm-commits]

================
@@ -191,10 +192,8 @@ class NodeMetadata {
         everConservativelyAllocatable(Other.everConservativelyAllocatable)
 #endif
   {
-    if (NumOpts > 0) {
-      std::copy(&Other.OptUnsafeEdges[0], &Other.OptUnsafeEdges[NumOpts],
-                &OptUnsafeEdges[0]);
-    }
+    if (NumOpts > 0)
----------------
kuhar wrote:

Do we need this condition? I'd expect `llvm::copy` to handle the empty case, but I could also see this being conditional useful for line-based debugging...

https://github.com/llvm/llvm-project/pull/137539