Constant mmtk::util::heap::layout::vm_layout_constants::LOG_PAGES_IN_SPACE64

pub const LOG_PAGES_IN_SPACE64: usize = LOG_SPACE_SIZE_64 as usize - LOG_BYTES_IN_PAGE as usize; // 0x0_000_000_000_000_01dusize

log_2 of the number of pages in a 64-bit space