Blender Git Loki

Possible fix for [#32141] Crash when using a mask as the factor input
for a color combine (mix) node with render resolution at 100%

Seems to be that the MaskNode has been created as a complex node. But no
complex features were used. Converted the execute pixel to simple
execution. And it sees that the crash does not happen.

Not sure if it is the issue is solved. I am going to let the user retest
with this revision.