[heap] Reschedule minor concurrent marking in allocation observer

This CL reschedules minor concurrent marking in MinorMCTaskObserver.
This allows to make continuous concurrent marking progress.

Bug: v8:13012
Change-Id: I5cc4e02a60993dd5ce970244274d4d5f99b4a550
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3885885Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Leon Bettscheider <bettscheider@google.com>
Cr-Commit-Position: refs/heads/main@{#83104}

src/heap/heap.cc

@@ -199,6 +199,13 @@ class MinorMCTaskObserver final : public AllocationObserver {
       : AllocationObserver(step_size), heap_(heap) {}
 
   void Step(int bytes_allocated, Address, size_t) override {
+    if (v8_flags.concurrent_minor_mc) {
+      if (heap_->incremental_marking()->IsMinorMarking()) {
+        heap_->concurrent_marking()->RescheduleJobIfNeeded(
+            GarbageCollector::MINOR_MARK_COMPACTOR);
+      }
+    }
+
     heap_->StartMinorMCIncrementalMarkingIfNeeded();
   }