sched/core: Simplify core-wide task selection

Tao suggested a two-pass task selection to avoid the retry loop.

Not only does it avoid the retry loop, it results in *much* simpler
code.

This also fixes an issue spotted by Josh Don where, for SMT3+, we can
forget to update max on the first pass and get to do an extra round.

Suggested-by: Tao Zhou <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Josh Don <[email protected]>
Reviewed-by: Vineeth Pillai (Microsoft) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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