Change ET-Forest to automatically recalculate its DFSnum's if too many slow
queries are made.

Patch by Daniel Berlin!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25323 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/LoopInfo.cpp b/lib/Analysis/LoopInfo.cpp
index cf6e20a..20b470f 100644
--- a/lib/Analysis/LoopInfo.cpp
+++ b/lib/Analysis/LoopInfo.cpp
@@ -104,7 +104,7 @@
 }
 
 
-void LoopInfo::Calculate(const ETForest &EF) {
+void LoopInfo::Calculate(ETForest &EF) {
   BasicBlock *RootNode = EF.getRoot();
 
   for (df_iterator<BasicBlock*> NI = df_begin(RootNode),
@@ -135,7 +135,7 @@
   return isNotAlreadyContainedIn(SubLoop->getParentLoop(), ParentLoop);
 }
 
-Loop *LoopInfo::ConsiderForLoop(BasicBlock *BB, const ETForest &EF) {
+Loop *LoopInfo::ConsiderForLoop(BasicBlock *BB, ETForest &EF) {
   if (BBMap.find(BB) != BBMap.end()) return 0;   // Haven't processed this node?
 
   std::vector<BasicBlock *> TodoStack;