Reapply LoopStrengthReduce and IVUsers cleanups, excluding the part

of 91296 that caused trouble -- the Processed list needs to be
preserved for the livetime of the pass, as AddUsersIfInteresting
is called from other passes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91641 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/IVUsers.cpp

@@ -53,7 +53,7 @@ static bool containsAddRecFromDifferentLoop(const SCEV *S, Loop *L) {
       if (newLoop == L)
         return false;
       // if newLoop is an outer loop of L, this is OK.
-      if (!LoopInfo::isNotAlreadyContainedIn(L, newLoop))
+      if (newLoop->contains(L->getHeader()))
         return false;
     }
     return true;
@@ -370,6 +370,7 @@ void IVUsers::releaseMemory() {
   IVUsesByStride.clear();
   StrideOrder.clear();
   Processed.clear();
+  IVUses.clear();
 }
 
 void IVStrideUse::deleted() {