Remove echo headlines. Use consistent target names.

restructure, making room for several tests

add missing rcs id

On arm64 char is unsigned, use int in getopt() loop.

Add a reproducer for uvm vnode deadlock fixed in revision 1.108 of
sys/uvm/uvm_vnode.c. The reproducer can trigger the deadlock in matter
of seconds but only performs 100 tries by default; in order t

Add a reproducer for uvm vnode deadlock fixed in revision 1.108 of
sys/uvm/uvm_vnode.c. The reproducer can trigger the deadlock in matter
of seconds but only performs 100 tries by default; in order to make it a
viable part of a full `make regress' run. Running it indefinitely can be
done by passing the `-I' option.

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