[SystemZ] Give the EXRL_Pseudo a size value of 6 bytes.

This pseudo is expanded very late (AsmPrinter) and therefore has to have a
correct size value, or the branch relaxation pass may make a wrong decision.

Review: Ulrich Weigand

Author: JonPsson

llvm/lib/Target/SystemZ/SystemZInstrInfo.td

@@ -2173,7 +2173,7 @@ let hasSideEffects = 1 in {
   def EX   : SideEffectBinaryRX<"ex", 0x44, ADDR64>;
   def EXRL : SideEffectBinaryRILPC<"exrl", 0xC60, ADDR64>;
   let hasNoSchedulingInfo = 1 in
-    def EXRL_Pseudo : Pseudo<(outs), (ins i64imm:$TargetOpc, ADDR64:$lenMinus1,
+    def EXRL_Pseudo : Alias<6, (outs), (ins i64imm:$TargetOpc, ADDR64:$lenMinus1,
                                           bdaddr12only:$bdl1, bdaddr12only:$bd2),
                                           []>;
 }