ARM::tPOP and tPOP_RET each has an extra writeback operand now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83214 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/Thumb1InstrInfo.cpp b/lib/Target/ARM/Thumb1InstrInfo.cpp
index dc4ce64..e1f9338 100644
--- a/lib/Target/ARM/Thumb1InstrInfo.cpp
+++ b/lib/Target/ARM/Thumb1InstrInfo.cpp
@@ -178,6 +178,7 @@
   DebugLoc DL = MI->getDebugLoc();
   MachineInstrBuilder MIB = BuildMI(MF, DL, get(ARM::tPOP));
   AddDefaultPred(MIB);
+  MIB.addReg(0); // No write back.
 
   bool NumRegs = 0;
   for (unsigned i = CSI.size(); i != 0; --i) {