Reland Force full GCwhenever CollectAllGarbage is meant to trigger a full GC.

src/heap/mark-compact-inl.h

Index: src/heap/mark-compact-inl.h
diff --git a/src/heap/mark-compact-inl.h b/src/heap/mark-compact-inl.h
index 7ba34848fda61f5d33ca6dad8cbd25f5be0215dc..1ac9a5973a36ad4b5ddb2ce607e0ec8a264aa1b8 100644
--- a/src/heap/mark-compact-inl.h
+++ b/src/heap/mark-compact-inl.h
@@ -23,6 +23,9 @@ void MarkCompactCollector::SetFlags(int flags) {
   reduce_memory_footprint_ = ((flags & Heap::kReduceMemoryFootprintMask) != 0);
   abort_incremental_marking_ =
       ((flags & Heap::kAbortIncrementalMarkingMask) != 0);
+  finalize_incremental_marking_ =
+      ((flags & Heap::kFinalizeIncrementalMarkingMask) != 0);
+  DCHECK(!finalize_incremental_marking_ || !abort_incremental_marking_);
 }