[llvm] [X86][MC] Support encoding/decoding for JMPABS (PR #72835)

[Phoebe Wang via llvm-commits]

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@@ -354,7 +363,8 @@ class X86Inst<bits<8> opcod, Format f, ImmType i, dag outs, dag ins,
   string EVEX2VEXOverride = ?;
 
   bit notEVEX2VEXConvertible = 0; // Prevent EVEX->VEX conversion.
-  bit ExplicitVEXPrefix = 0; // Force the instruction to use VEX encoding.
+  ExplicitOpPrefix explicitOpPrefix = NoExplicitOpPrefix;
+  bits<2> explicitOpPrefixBits = explicitOpPrefix.Value;
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phoebewang wrote:

Why need to define both?

https://github.com/llvm/llvm-project/pull/72835