Skip "dontInvalidate" check in erase from gc

ConflictSet.cpp

@@ -1747,6 +1747,7 @@ void maybeDownsize(Node *self, WriteContext *tls, ConflictSet::Impl *impl,
 // path to self. May invalidate children of self->parent. Returns a pointer to
 // the node after self. If erase invalidates the pointee of `dontInvalidate`, it
 // will update it to its new pointee as well. Precondition: `self->entryPresent`
+template <bool kCheckDontInvalidate = true>
 Node *erase(Node *self, WriteContext *tls, ConflictSet::Impl *impl,
             bool logical, Node *&dontInvalidate) {
   ++tls->accum.entries_erased;
@@ -1768,8 +1769,10 @@ Node *erase(Node *self, WriteContext *tls, ConflictSet::Impl *impl,
   if (self->numChildren != 0) {
     const bool update = result == dontInvalidate;
     maybeDownsize(self, tls, impl, result);
-    if (update) {
-      dontInvalidate = result;
+    if constexpr (kCheckDontInvalidate) {
+      if (update) {
+        dontInvalidate = result;
+      }
     }
     return result;
   }
@@ -1852,13 +1855,21 @@ Node *erase(Node *self, WriteContext *tls, ConflictSet::Impl *impl,
 
   const bool update = result == dontInvalidate;
   maybeDownsize(parent, tls, impl, result);
-  if (update) {
-    dontInvalidate = result;
+  if constexpr (kCheckDontInvalidate) {
+    if (update) {
+      dontInvalidate = result;
+    }
   }
 
   return result;
 }
 
+Node *erase(Node *self, WriteContext *tls, ConflictSet::Impl *impl,
+            bool logical) {
+  Node *dummy;
+  return erase<false>(self, tls, impl, logical, dummy);
+}
+
 Node *nextSibling(Node *node) {
   for (;;) {
     if (node->parent == nullptr) {
@@ -3262,8 +3273,7 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
         // There's no way to insert a range such that range version of the right
         // node is greater than the point version of the left node
         assert(n->entry.rangeVersion <= oldestVersion);
-        Node *dummy = nullptr;
-        n = erase(n, &tls, this, /*logical*/ false, dummy);
+        n = erase(n, &tls, this, /*logical*/ false);
       } else {
         maybeDecreaseCapacity(n, &tls, this);
         n = nextPhysical(n);