[heap] Bailout in IncrementalMarkingJob::ScheduleTask

Currently MinorMC does not suport incremental marking but uses the
IncrementalMarking class to bootstrap concurrent marking.

IncrementalMarkingJob::ScheduleTask is called from multiple call
sites which assume major incremental marking. This CL adds a bailout
to ScheduleTask on IsMajorMarking()==false to avoid erreoneously
doing incremental steps while in MinorMC mode.

Bug: v8:13012
Change-Id: I57803a8f258697478a9696716063c8c2cae1ae30
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865147Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Leon Bettscheider <bettscheider@google.com>
Cr-Commit-Position: refs/heads/main@{#82891}

src/heap/incremental-marking-job.cc

@@ -41,7 +41,8 @@ void IncrementalMarkingJob::ScheduleTask() {
   base::MutexGuard guard(&mutex_);
 
   if (is_task_pending_ || heap_->IsTearingDown() ||
-      !FLAG_incremental_marking_task) {
+      !FLAG_incremental_marking_task ||
+      !heap_->incremental_marking()->IsMajorMarking()) {
     return;
   }