GC_bytes_in_used_blocks  121 gc/checksums.c word GC_bytes_in_used_blocks;
GC_bytes_in_used_blocks  132 gc/checksums.c    GC_bytes_in_used_blocks += bytes;
GC_bytes_in_used_blocks  139 gc/checksums.c     GC_bytes_in_used_blocks = 0;
GC_bytes_in_used_blocks  142 gc/checksums.c     		GC_bytes_in_used_blocks, bytes_in_free_blocks);
GC_bytes_in_used_blocks  144 gc/checksums.c     if (GC_bytes_in_used_blocks + bytes_in_free_blocks != GC_heapsize) {