Standardize default layout to None
in internals (dispatch, lowering and compilation) and non-default layouts to concrete layouts.
#23288
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Standardize default layout to
None
in internals (dispatch, lowering and compilation) and non-default layouts to concrete layouts.This massively simplifies the amount of checks we need and improves dispatch time too. It also fixes a donation bug being hit in serving code related to layouts and non-standardization of default layout in JAX.