Manage MachineFunctions with an analysis Pass instead of the Annotable

mechanism. To support this, make MachineFunctionPass a little more
complete.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77654 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/PrologEpilogInserter.cpp

@@ -111,7 +111,6 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
 
 #if 0
 void PEI::getAnalysisUsage(AnalysisUsage &AU) const {
-  AU.setPreservesCFG();
   if (ShrinkWrapping || ShrinkWrapFunc != "") {
     AU.addRequired<MachineLoopInfo>();
     AU.addRequired<MachineDominatorTree>();