RedundantFlagCalculationElimination: fix convergence issue

If both the destination and the flags are dead for an AddWithFlags, we need to
eliminate it in one pass. If we only replace without elimiating, we would need a
second DCE pass to eliminate. We want DCE to finish in one pass, so fix this.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

FEXCore/Source/Interface/IR/Passes/RedundantFlagCalculationElimination.cpp

@@ -362,7 +362,7 @@ void DeadFlagCalculationEliminination::Run(IREmitter* IREmit) {
           bool Eliminated = false;
 
           if ((FlagsRead & Info.Write) == 0) {
-            if (Info.CanEliminate && CodeNode->GetUses() == 0) {
+            if ((Info.CanEliminate || Info.CanReplace) && CodeNode->GetUses() == 0) {
               IREmit->Remove(CodeNode);
               Eliminated = true;
             } else if (Info.CanReplace) {