Reland "Merge cellspace into old pointer space"

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index f6e075fa1aa27a212a66fea441987625216a47a6..426e4326331cd84ced6fd02fc02deb00f3f1a912 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -194,8 +194,6 @@ AllocationResult Heap::AllocateRaw(int size_in_bytes, AllocationSpace space,
     }
   } else if (LO_SPACE == space) {
     allocation = lo_space_->AllocateRaw(size_in_bytes, NOT_EXECUTABLE);
-  } else if (CELL_SPACE == space) {
-    allocation = cell_space_->AllocateRaw(size_in_bytes);
   } else {
     DCHECK(MAP_SPACE == space);
     allocation = map_space_->AllocateRaw(size_in_bytes);
@@ -387,7 +385,6 @@ bool Heap::AllowedToBeMigrated(HeapObject* obj, AllocationSpace dst) {
     case CODE_SPACE:
       return dst == src && type == CODE_TYPE;
     case MAP_SPACE:
-    case CELL_SPACE:
     case LO_SPACE:
       return false;
   }