Make DeadMachineInstructionElim preserve CFG

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273330 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/DeadMachineInstructionElim.cpp

@@ -42,6 +42,11 @@ namespace {
      initializeDeadMachineInstructionElimPass(*PassRegistry::getPassRegistry());
     }
 
+    void getAnalysisUsage(AnalysisUsage &AU) const override {
+      AU.setPreservesCFG();
+      MachineFunctionPass::getAnalysisUsage(AU);
+    }
+
   private:
     bool isDead(const MachineInstr *MI) const;
   };