software interpreter like in CPU threading.
This patch also reworks the cycle detection
to make it more robust.

Since the dependency computation also does
cycle detection, there is no need to disable
group-calc(threaded/OpenCL/SW Interpreter)
for non-leaf nodes in recursive interpret.

The rework of cycle detection ensures that
it fixes tdf#95748 correctly.

Change-Id: I460addb768eedc0914491a3d24ae7220c3afbb20
Reviewed-on: https://gerrit.libreoffice.org/55665Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Jenkins