Don't forget to transfer implicit uses of return instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147752 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/Thumb1FrameLowering.cpp b/lib/Target/ARM/Thumb1FrameLowering.cpp
index 16c7cbc..bb327b0 100644
--- a/lib/Target/ARM/Thumb1FrameLowering.cpp
+++ b/lib/Target/ARM/Thumb1FrameLowering.cpp
@@ -278,8 +278,11 @@
 
     emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, VARegSaveSize);
 
-    AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tBX_RET_vararg))
-      .addReg(ARM::R3, RegState::Kill));
+    MachineInstrBuilder MIB =
+      BuildMI(MBB, MBBI, dl, TII.get(ARM::tBX_RET_vararg))
+      .addReg(ARM::R3, RegState::Kill);
+    AddDefaultPred(MIB);
+    MIB->copyImplicitOps(&*MBBI);
     // erase the old tBX_RET instruction
     MBB.erase(MBBI);
   }