[heap] Minor MC: Add marking

test/cctest/heap/test-page-promotion.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/factory.h"
 #include "src/heap/array-buffer-tracker.h"
 #include "src/heap/spaces-inl.h"
 #include "src/isolate.h"
 // FIXME(mstarzinger, marja): This is weird, but required because of the missing
 // (disallowed) include: src/factory.h -> src/objects-inl.h
@@ skipping 24 matching lines @@
   v8::Isolate* isolate = v8::Isolate::New(create_params);
   return isolate;
 }
 
 }  // namespace
 
 namespace v8 {
 namespace internal {
 
 UNINITIALIZED_TEST(PagePromotion_NewToOld) {
+  if (!i::FLAG_incremental_marking) return;
   v8::Isolate* isolate = NewIsolateForPagePromotion();
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   {
     v8::Isolate::Scope isolate_scope(isolate);
     v8::HandleScope handle_scope(isolate);
     v8::Context::New(isolate)->Enter();
     Heap* heap = i_isolate->heap();
 
     std::vector<Handle<FixedArray>> handles;
     heap::SimulateFullSpace(heap->new_space(), &handles);
@@ skipping 109 matching lines @@
     heap->CollectGarbage(NEW_SPACE, i::GarbageCollectionReason::kTesting);
     heap->new_space()->Shrink();
     heap->memory_allocator()->unmapper()->WaitUntilCompleted();
     heap->mark_compact_collector()->sweeper().StartSweeperTasks();
     heap->mark_compact_collector()->EnsureSweepingCompleted();
   }
 }
 
 }  // namespace internal
 }  // namespace v8