restore visitor count

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
optimize some hash table operations

Link: https://github.com/GeneAssembly/biosal/issues/725
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
core: disable memory fences in ring (it works on x86)

Link: https://github.com/GeneAssembly/biosal/issues/725
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: disable wait code path since we don't use it

time ./scripts/assembly_debugging/spate-saureus-fasta-gz-4x8.sh &> log
real    2m8.855s

Link: https://github.com/GeneAssembly/biosal/issues/725
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>