[heap] Fix gcc compile error related to lambda visibility

GCC may be buggy in how it handles visibility in this case. The
previous nested implementation resulted in a 'lambda1 declared with
greater visibility than the type of its field lambda2' error.

Unnesting the inner lambda works around the error.

Bug: v8:8126
Change-Id: Id822ca80fec9af27c4adc7ff53be3b6d9478f0d7
Reviewed-on: https://chromium-review.googlesource.com/1206310Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55638}

src/heap/mark-compact.cc

@@ -3003,13 +3003,14 @@ class RememberedSetUpdatingItem : public UpdatingItem {
     if (chunk_->typed_slot_set<OLD_TO_NEW, AccessMode::NON_ATOMIC>() !=
         nullptr) {
       CHECK_NE(chunk_->owner(), heap_->map_space());
+      const auto check_and_update_old_to_new_slot_fn =
+          [this](MaybeObject** slot) {
+            return CheckAndUpdateOldToNewSlot(reinterpret_cast<Address>(slot));
+          };
       RememberedSet<OLD_TO_NEW>::IterateTyped(
-          chunk_, [this](SlotType slot_type, Address host_addr, Address slot) {
+          chunk_, [=](SlotType slot_type, Address host_addr, Address slot) {
             return UpdateTypedSlotHelper::UpdateTypedSlot(
-                heap_, slot_type, slot, [this](MaybeObject** slot) {
-                  return CheckAndUpdateOldToNewSlot(
-                      reinterpret_cast<Address>(slot));
-                });
+                heap_, slot_type, slot, check_and_update_old_to_new_slot_fn);
           });
     }
     if ((updating_mode_ == RememberedSetUpdatingMode::ALL) &&