[ARM] Fix isRenamable flag setting on expanded VSTMDIA opcode.

Fixes expensive-check ARM buildbot failure.

llvm-svn: 320718
diff --git a/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index 1c64e3d..f1def98 100644
--- a/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -1469,7 +1469,9 @@
       unsigned SrcReg = MI.getOperand(OpIdx++).getReg();
 
       // Copy the destination register.
-      MIB.add(MI.getOperand(OpIdx++));
+      MachineOperand Dst(MI.getOperand(OpIdx++));
+      Dst.setIsRenamable(false);
+      MIB.add(Dst);
 
       // Copy the predicate operands.
       MIB.add(MI.getOperand(OpIdx++));