Add an MF argument to MI::copyImplicitOps().

This function is often used to decorate dangling instructions, so a
context reference is required to allocate memory for the operands.

Also add a corresponding MachineInstrBuilder method.

llvm-svn: 170797
diff --git a/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp b/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
index edd73c2..123ada6 100644
--- a/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
+++ b/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
@@ -281,7 +281,7 @@
       BuildMI(MBB, MBBI, dl, TII.get(ARM::tBX_RET_vararg))
       .addReg(ARM::R3, RegState::Kill);
     AddDefaultPred(MIB);
-    MIB->copyImplicitOps(&*MBBI);
+    MIB.copyImplicitOps(&*MBBI);
     // erase the old tBX_RET instruction
     MBB.erase(MBBI);
   }
@@ -352,7 +352,7 @@
         continue;
       Reg = ARM::PC;
       (*MIB).setDesc(TII.get(ARM::tPOP_RET));
-      MIB->copyImplicitOps(&*MI);
+      MIB.copyImplicitOps(&*MI);
       MI = MBB.erase(MI);
     }
     MIB.addReg(Reg, getDefRegState(true));