[llvm] [X86][MC] Support Enc/Dec for EGPR for promoted CET instruction (PR #76023)

[Phoebe Wang via llvm-commits]

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@@ -520,6 +520,7 @@ let SchedRW = [WriteSystem] in {
     } // Defs SSP
   } // Uses SSP
 
+let Predicates = [NoEGPR] in {
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phoebewang wrote:

How about other CET instuctions like `RDSSPD`? It has GPR operand too. It looks to me strange the symmetry instuction doesn't gain APX promotion.

https://github.com/llvm/llvm-project/pull/76023