[llvm] [X86] Avoid useless DomTree in flags copy lowering (PR #97628)

[Alexis Engelke via llvm-commits]

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@@ -688,7 +707,7 @@ bool X86FlagsCopyLoweringPass::runOnMachineFunction(MachineFunction &MF) {
       }
 #endif
 
-  return true;
+  return !Copies.empty();
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aengelke wrote:

Good catch, this was just a left-over from a previous optimization attempt.

https://github.com/llvm/llvm-project/pull/97628