[heap] Thread through GC flags in memory reducer and incremental marking.

test/cctest/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2794 matching lines @@
   MarkCompactCollector* collector = heap->mark_compact_collector();
   if (collector->sweeping_in_progress()) {
     collector->EnsureSweepingCompleted();
   }
 
   IncrementalMarking* marking = heap->incremental_marking();
   marking->Stop();
   marking->Start(Heap::kReduceMemoryFootprintMask);
   CHECK_NE(0, heap->current_gc_flags() & Heap::kReduceMemoryFootprintMask);
 
-  heap->Scavenge();
+  heap->CollectGarbage(NEW_SPACE);
+  // NewSpace scavenges should not overwrite the flags.
   CHECK_NE(0, heap->current_gc_flags() & Heap::kReduceMemoryFootprintMask);
 
   heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
   CHECK_EQ(Heap::kNoGCFlags, heap->current_gc_flags());
 }
 
 
 TEST(IdleNotificationFinishMarking) {
   i::FLAG_allow_natives_syntax = true;
   CcTest::InitializeVM();
@@ skipping 3671 matching lines @@
   {
     SharedFunctionInfo::Iterator iterator(isolate);
     while (iterator.Next()) sfi_count--;
   }
 
   CHECK_EQ(0, sfi_count);
 }
 
 }  // namespace internal
 }  // namespace v8