Manage MachineFunctions with an analysis Pass instead of the Annotable

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

llvm-svn: 77654

llvm/lib/CodeGen/MachineLoopInfo.cpp

@@ -41,4 +41,5 @@ bool MachineLoopInfo::runOnMachineFunction(MachineFunction &) {
 void MachineLoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
   AU.addRequired<MachineDominatorTree>();
+  MachineFunctionPass::getAnalysisUsage(AU);
 }