Provide baseline GC version.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 0497ad5f6a3d0b12ff72fbf94c6c61f43f8dab4b..90b29fdcb14e46098ff5439ef2feafe6b74d7eed 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -224,7 +224,7 @@ int Heap::GcSafeSizeOfOldObject(HeapObject* object) {
   return object->SizeFromMap(map_word.ToMap());
 }
 
-
+#ifndef BASELINE_GC
 int Heap::GcSafeSizeOfOldObjectWithEncodedMap(HeapObject* object) {
   ASSERT(!Heap::InNewSpace(object));  // Code only works for old objects.
   ASSERT(MarkCompactCollector::are_map_pointers_encoded());
@@ -240,6 +240,7 @@ int Heap::GcSafeSizeOfOldObjectWithEncodedMap(HeapObject* object) {
     return object->SizeFromMap(map);
   }
 }
+#endif
 
 
 GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space) {
@@ -3984,9 +3985,14 @@ void Heap::Verify() {
 
   new_space_.Verify();
 
+#ifndef BASELINE_GC
   VerifyPointersAndDirtyRegionsVisitor dirty_regions_visitor;
   old_pointer_space_->Verify(&dirty_regions_visitor);
   map_space_->Verify(&dirty_regions_visitor);
+#else
+  old_pointer_space_->Verify(&visitor);
+  map_space_->Verify(&visitor);
+#endif
 
   VerifyPointersUnderWatermark(old_pointer_space_,
                                &IteratePointersInDirtyRegion);
@@ -4182,7 +4188,11 @@ void Heap::IterateAndMarkPointersToFromSpace(Address start,
   Address slot_address = start;
   Page* page = Page::FromAddress(start);
 
+#ifndef BASELINE_GC
   uint32_t marks = page->GetRegionMarks();
+#else
+  uint32_t marks = 0;
+#endif
 
   while (slot_address < end) {
     Object** slot = reinterpret_cast<Object**>(slot_address);
@@ -4197,7 +4207,9 @@ void Heap::IterateAndMarkPointersToFromSpace(Address start,
     slot_address += kPointerSize;
   }
 
+#ifndef BASELINE_GC
   page->SetRegionMarks(marks);
+#endif
 }
 
 
@@ -4207,6 +4219,7 @@ uint32_t Heap::IterateDirtyRegions(
     Address area_end,
     DirtyRegionCallback visit_dirty_region,
     ObjectSlotCallback copy_object_func) {
+#ifndef BASELINE_GC
   uint32_t newmarks = 0;
   uint32_t mask = 1;
 
@@ -4263,6 +4276,10 @@ uint32_t Heap::IterateDirtyRegions(
   }
 
   return newmarks;
+#else
+  visit_dirty_region(area_start, area_end, copy_object_func);
+  return 0;
+#endif
 }