This reverts commit 76f7a0c1c0.
Unfortunately, the performance issue is still present with PBOs even on
Monterey. During the 27.2 beta, macOS users even on Monterey have been
reporting a performance regression, and when the profiler data for those
users was looked at, major performance loss was noted in the
stage_output_texture function. This commit was the only probable cause.
9bd9513e94