viable/strict/1787723889: Remove dead mixed_mm remnants from inductor and torchgen (#193721)
- PyTorch: 83 events in the last 90 days
- PyTorch: 83th Release in the last 90 days
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What happened
The tuned mixed_mm kernel path was removed in #147151 , but its support machinery was left behind. This PR removes the dead remnants and formalizes the deprecation of the two config knobs: use_mixed_mm and mixed_mm_choice were comment-marked "DEPRECATED. This setting is ignored." but silently no-oped; they now use the formal Config(deprecated=True) mechanism, so setting them emits a FutureWarning (matching the exist…
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