Remove no-op function

Author: linuxrocks123

llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp

@@ -154,10 +154,6 @@ class SILowerControlFlowLegacy : public MachineFunctionPass {
     return "SI Lower control flow pseudo instructions";
   }
 
-  MachineFunctionProperties getRequiredProperties() const override {
-    return MachineFunctionProperties().setIsSSA();
-  }
-
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.addUsedIfAvailable<LiveIntervalsWrapperPass>();
     // Should preserve the same set that TwoAddressInstructions does.