Improve codegen for nextLogical

ConflictSet.cpp

@@ -1574,10 +1574,21 @@ Node *nextPhysical(Node *node) {
 }
 
 Node *nextLogical(Node *node) {
-  for (node = nextPhysical(node); node != nullptr && !node->entryPresent;
-       node = nextPhysical(node))
-    ;
-  return node;
+  int index = -1;
+  for (;;) {
+    auto nextChild = getChildGeq(node, index + 1);
+    if (nextChild != nullptr) {
+      for (node = nextChild; !node->entryPresent;
+           node = getFirstChildExists(node)) {
+      }
+      return node;
+    }
+    index = node->parentsIndex;
+    node = node->parent;
+    if (node == nullptr) {
+      return nullptr;
+    }
+  }
 }
 
 // Invalidates `self`, replacing it with a node of at least capacity.