Commit 67444cbe disabled svDoubleRef completely for OpenCL, which means
many formulas weren't handled by OpenCL even if the implicit intersection
problems are quite rare. This patch tries to detect formulas implicit
intersections in formulas and if it's certain that a formula does not
contain one, then it's ok to use OpenCL with svDoubleRef.

The detection is done by having ScCompiler analyze each opcode call
and its parameters, which should provide sufficient information to know
if implicit intersection can take place or not. The extra compilation
can be avoided by using OpenCL's compilation and doing the svDoubleRef
conversion later on the RPN code, to be done later.

This is opt-in, so if unsure don't do anything, if it turns out that some
opcode needs special handling, it can be simply added.

Change-Id: Iaa52fa7eb8b14dc8c2b92384a21e2ab8efe0ddd7
Reviewed-on: https://gerrit.libreoffice.org/57959
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>