[clang] [llvm] [X86][APX] Emit SetZUCC instead of legacy setcc when ZU is enabled (PR #173965)

[Phoebe Wang via llvm-commits]

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@@ -269,6 +269,14 @@ void x86::getX86TargetFeatures(const Driver &D, const llvm::Triple &Triple,
 
         Features.push_back(
             Args.MakeArgString((IsNegative ? "-" : "+") + Value));
+
+        // Implicitly add prefer-setzucc feature when ZU feature is enabled. The
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phoebewang wrote:

I don't think we need `prefer-setzucc` if we always enabled it. Maybe add a tuning `prefer-setcc` to disable it when necessary?

https://github.com/llvm/llvm-project/pull/173965