uvmspace_exec: Remove disfunctional "optimization".
uvmspace_exec: Remove disfunctional "optimization".

The optimization goes through great lengths to use less optimized code
paths in place of the simple path, where the latter is actually faster.

ok tedu, guenther

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars