[handles] Add DCHECK to ensure main thread for main thread handle

Make main-thread handle allocation fail more gracefully when run on
background threads.

Bug: v8:10315
Change-Id: Iece9215aed21020b97fede40d78ea56b9baffac4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2689184
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72646}

src/handles/handles-inl.h

@@ -178,6 +178,8 @@ Address* HandleScope::CreateHandle(Isolate* isolate, Address value) {
 
 Address* HandleScope::GetHandle(Isolate* isolate, Address value) {
   DCHECK(AllowHandleAllocation::IsAllowed());
+  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();
   CanonicalHandleScope* canonical = data->canonical_scope;
   return canonical ? canonical->Lookup(value) : CreateHandle(isolate, value);