Do implicit intersection computation for
for single parameter functions while generating
RPN token array when the argument is a doubleref
with relative row references. This optimization
is not done when under forced array mode or
matrix formula mode.

The computation logic was already present in ScInterpreter,
so factored it out and reused.

This also adds unit tests to ensure correctness of
II computation for various cases.

Change-Id: I509c3f6f811aa036b1dc3296e8f68904b26c3c49
Reviewed-on: https://gerrit.libreoffice.org/53885
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>