Use setPreservesAll and setPreservesCFG in CodeGen passes.

llvm-svn: 77754

llvm/lib/CodeGen/MachineModuleInfo.cpp

@@ -306,6 +306,7 @@ struct DebugLabelFolder : public MachineFunctionPass {
   DebugLabelFolder() : MachineFunctionPass(&ID) {}
 
   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    AU.setPreservesCFG();
     AU.addPreservedID(MachineLoopInfoID);
     AU.addPreservedID(MachineDominatorsID);
     MachineFunctionPass::getAnalysisUsage(AU);