[runtime] Check if we have a pending exception before returning it

Bug: chromium:1263462
Change-Id: I8b367201f1141921a0b34d6fbf1453d72a6fae37
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3244420Reviewed-by: Samuel Groß <saelo@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77557}

src/execution/isolate-inl.h

@@ -50,7 +50,7 @@ bool Isolate::has_pending_message() {
 }
 
 Object Isolate::pending_exception() {
-  DCHECK(has_pending_exception());
+  CHECK(has_pending_exception());
   DCHECK(!thread_local_top()->pending_exception_.IsException(this));
   return thread_local_top()->pending_exception_;
 }