LAA: simplify LoopAccessInfoManager::clear (NFC) (#125488)

DenseMap::erase() doesn't invalidate the iterator.

llvm/lib/Analysis/LoopAccessAnalysis.cpp

@@ -3078,7 +3078,6 @@ const LoopAccessInfo &LoopAccessInfoManager::getInfo(Loop &L) {
   return *It->second;
 }
 void LoopAccessInfoManager::clear() {
-  SmallVector<Loop *> ToRemove;
   // Collect LoopAccessInfo entries that may keep references to IR outside the
   // analyzed loop or SCEVs that may have been modified or invalidated. At the
   // moment, that is loops requiring memory or SCEV runtime checks, as those cache
@@ -3087,11 +3086,8 @@ void LoopAccessInfoManager::clear() {
     if (LAI->getRuntimePointerChecking()->getChecks().empty() &&
         LAI->getPSE().getPredicate().isAlwaysTrue())
       continue;
-    ToRemove.push_back(L);
-  }
-
-  for (Loop *L : ToRemove)
     LoopAccessInfoMap.erase(L);
+  }
 }
 
 bool LoopAccessInfoManager::invalidate(