Use setPreservesAll and setPreservesCFG in CodeGen passes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77754 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/RegAllocSimple.cpp

@@ -70,6 +70,7 @@ namespace {
     bool runOnMachineFunction(MachineFunction &Fn);
 
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesCFG();
       AU.addRequiredID(PHIEliminationID);           // Eliminate PHI nodes
       MachineFunctionPass::getAnalysisUsage(AU);
     }