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

[Phoebe Wang via llvm-commits]

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@@ -155,6 +155,8 @@ namespace X86Local {
   enum {
     AdSize16 = 1, AdSize32 = 2, AdSize64 = 3
   };
+
+  enum { ExplicitREX2 = 1 };
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phoebewang wrote:

No need enum for one entry.

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