[compiler] Partially replace SourceTextModule with direct reads

Replace the SourceTextModuleRef::GetCell method.

Bug: v8:7790
Change-Id: I65e2f121b9d37c39e5d208d68409f61724ce198e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2410192Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69966}

src/compiler/js-heap-broker.cc

@@ -3889,11 +3889,11 @@ base::Optional<ObjectRef> JSArrayRef::GetOwnCowElement(
 }
 
 base::Optional<CellRef> SourceTextModuleRef::GetCell(int cell_index) const {
-  if (data_->should_access_heap()) {
-    AllowHandleAllocationIfNeeded allow_handle_allocation(data()->kind(),
-                                                          broker()->mode());
-    AllowHandleDereferenceIfNeeded allow_handle_dereference(data()->kind(),
-                                                            broker()->mode());
+  if (data_->should_access_heap() || FLAG_turbo_direct_heap_access) {
+    AllowHandleAllocationIfNeeded allow_handle_allocation(
+        data()->kind(), broker()->mode(), FLAG_turbo_direct_heap_access);
+    AllowHandleDereferenceIfNeeded allow_handle_dereference(
+        data()->kind(), broker()->mode(), FLAG_turbo_direct_heap_access);
     return CellRef(broker(), broker()->CanonicalPersistentHandle(
                                  object()->GetCell(cell_index)));
   }