Fix assertion failure msg.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2366 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/vg_from_ucode.c b/coregrind/vg_from_ucode.c
index 211f58e..d85cefa 100644
--- a/coregrind/vg_from_ucode.c
+++ b/coregrind/vg_from_ucode.c
@@ -3918,7 +3918,7 @@
                              anyFlagUse(u), 
                              u->opcode, u->size, u->val1, u->val2 );
                           break;
-            default: VG_(core_panic)("emitUInstr:non-shift-op");
+            default: VG_(core_panic)("emitUInstr:shift-op");
          }
          break;
       }