heap: Be more conservative when delaying finalization

When delaying finalization we considered the maximum of the current time
to task and the recorded average. In case there's no recorded average
the GC would consider the current time to task as estimate which is too
aggresive as V8 may never get a task executed.

Be fully conservative about recorded task times and bail out in such
cases.

Bug: chromium:1049957
Change-Id: Ibaac242f72459341a170af80e63fb2266f91b0eb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2043809
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66196}

src/heap/incremental-marking.cc

@@ -790,6 +790,7 @@ double IncrementalMarking::CurrentTimeToMarkingTask() const {
       heap_->tracer()->AverageTimeToIncrementalMarkingTask();
   const double current_time_to_marking_task =
       incremental_marking_job_.CurrentTimeToTask(heap_);
+  if (recorded_time_to_marking_task == 0.0) return 0.0;
   return Max(recorded_time_to_marking_task, current_time_to_marking_task);
 }