cpu: helper to probe DSP functions

This depends on !1453 (merged) and is a dependency of !1430 (merged)

added Component::Core label

mentioned in merge request !1430 (merged)

marked this merge request as ready

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changed the description

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This could be used to move the SIMD code out of the deinterlacer and into separate modules.

I'm also trying to rework the adjust filter but not sure if/when I have time to complete

added MRStatus::InReview label and removed MRStatus::Acceptable label

resolved all threads

added 37 commits

• af06a65c...35ec60b5 - 34 commits from branch videolan:master
• 77244b74 - threads: add vlc_once_begin() and vlc_once_complete()
• 0da095bd - threads: rewrite and inline vlc_once()
• 451c30a5 - cpu: semi-generic helper for hooking SIMD functions

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