kFromSpace        409 src/spaces.cc    bool in_to_space = (semi_space->id() != kFromSpace);
kFromSpace       1310 src/spaces.cc    ASSERT_EQ(from_space_.id(), kFromSpace);
kFromSpace       1464 src/spaces.cc    bool becomes_to_space = (id_ == kFromSpace);
kFromSpace       1465 src/spaces.cc    id_ = becomes_to_space ? kToSpace : kFromSpace;
kFromSpace       1530 src/spaces.cc    bool is_from_space = (id_ == kFromSpace);
kFromSpace       2069 src/spaces.h         from_space_(heap, kFromSpace),