Handle long-disp stuff more consistently

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76059 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/SystemZ/SystemZInstrInfo.cpp b/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 914d333..c54ce53 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -650,7 +650,8 @@
   case SystemZ::FMOV64mr:  return get(SystemZ::FMOV64mry);
   case SystemZ::FMOV32rm:  return get(SystemZ::FMOV32rmy);
   case SystemZ::FMOV64rm:  return get(SystemZ::FMOV64rmy);
-  default: return get(Opc);
+  default:
+   assert(0 && "Don't have long disp version of this instruction");
   }
 }