Diff of /src/compiler/x86/insts.lisp [0ace89] .. [5d4902] Maximize Restore

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--- a/src/compiler/x86/insts.lisp
+++ b/src/compiler/x86/insts.lisp
@@ -1036,6 +1036,11 @@
      (emit-ea segment dst (reg-tn-encoding src)))))
 
 
+
+(define-instruction gs-segment-prefix (segment)
+  (:emitter
+   (emit-byte segment #x65)))
+
 ;;;; flag control instructions
 
 ;;; CLC -- Clear Carry Flag.