TLAB allocation in MacroAssembler::store_inline_type_fields_to_buf looks duplicated with MacroAssembler::tlab_allocate, we might use existing MacroAssembler::tlab_allocate instead of duplicated ones. It will add more verifications(__ verify_tlab() in debug mode) and use one less instruction(but add one more instruction in template interpreter). When UseTLAB is disabled, we can also try to allocate the buffer object in eden space.