EmitAtomicCmpSwap() custome inserter needs to delete the MI passed in. EmitAtomicBinary() already does this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93479 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMISelLowering.cpp

@@ -3130,6 +3130,9 @@ ARMTargetLowering::EmitAtomicCmpSwap(MachineInstr *MI,
   //  exitMBB:
   //   ...
   BB = exitMBB;
+
+  MF->DeleteMachineInstr(MI);   // The instruction is gone now.
+
   return BB;
 }