[llvm] [X86][CodeGen] Prefer KMOVkk_EVEX than KMOVkk when EGPR is supported (PR #74048)

[Simon Pilgrim via llvm-commits]

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@@ -625,8 +625,10 @@ void X86DomainReassignment::initConverters() {
   createReplacerDstCOPY(X86::MOVZX64rm16,
                         HasEGPR ? X86::KMOVWkm_EVEX : X86::KMOVWkm);
 
-  createReplacerDstCOPY(X86::MOVZX32rr16, X86::KMOVWkk);
-  createReplacerDstCOPY(X86::MOVZX64rr16, X86::KMOVWkk);
+  createReplacerDstCOPY(X86::MOVZX32rr16,
+                        HasEGPR ? X86::KMOVWkk_EVEX : X86::KMOVWkk);
+  createReplacerDstCOPY(X86::MOVZX64rr16,
+                        HasEGPR ? X86::KMOVWkk_EVEX : X86::KMOVWkk);
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RKSimon wrote:

Can we access + repurpose the EVEX->VEX tables to do this for us?

https://github.com/llvm/llvm-project/pull/74048