Tighten up the AnalysisUsage of lots of passes, primarily to correctly indicate whether or not they invalidate the CFGA

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2386 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/PromoteMemoryToRegister.cpp

@@ -53,6 +53,7 @@ namespace {
     //
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequired(DominanceFrontier::ID);
+      AU.preservesCFG();
     }
 
   private: