vo_opengl: refactor/fix mp_pass_perf code

This was needlessly complicated and prone to breakage, because even the
references to the ring buffer could end up getting invalidated and
containing garbage data on e.g. shader cache flush. For much the same
reason why we can't keep around the *timer_pool, we're also forced to
hard-copy the entire sample buffer per pass per frame.

Not a huge deal, though. This is, what, a few kB per frame? We have more
pressing CPU performance concerns anyway.

Also simplified/fixed some other code.

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