[handles] DCHECK that thread isn't parked when creating handles

Parked threads are not allowed to create new handles or access the heap
in any other way. This is a pretty fundamental invariant of our
safepoint mechanism, which doesn't stop parked threads.

Change-Id: I577dbeffbb70e0843644cdc12ffbef022890c364
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3324542
Auto-Submit: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78316}

src/handles/handles-inl.h

@@ -178,6 +178,7 @@ Address* HandleScope::CreateHandle(Isolate* isolate, Address value) {
 
 Address* HandleScope::GetHandle(Isolate* isolate, Address value) {
   DCHECK(AllowHandleAllocation::IsAllowed());
+  DCHECK(isolate->main_thread_local_heap()->IsRunning());
   DCHECK_WITH_MSG(isolate->thread_id() == ThreadId::Current(),
                   "main-thread handle can only be created on the main thread.");
   HandleScopeData* data = isolate->handle_scope_data();

src/handles/local-handles-inl.h

@@ -16,6 +16,7 @@ namespace internal {
 // static
 V8_INLINE Address* LocalHandleScope::GetHandle(LocalHeap* local_heap,
                                                Address value) {
+  DCHECK(local_heap->IsRunning());
   if (local_heap->is_main_thread())
     return LocalHandleScope::GetMainThreadHandle(local_heap, value);