* merge index_dtype_3
* new lowering with Invalid idx
* remove that dtype from range
* finish merge
* annotate better
* indentation
* dont need that anymore
* always process replay for openpilot
* more uop_given_valid for idx
* valid past index_child
* fix bug preventing load getting an alt value
* add track_match_stats back in in shapetracker and remove cache
* get_valid_idx -> get_valid and get_idx
* fix heuristics with new idx
* split line
* fix typo
* fix signature
* dont skip idx if stride is 0
the idx may still be invalid
* lower const with new valid
* delete to_indexed_uops
* update shapetracker test
* delete axis_is_masked
* add cache back
* move around comment
* fix get_valid bug
* move invalid fold to symbolic so its earlier
* cleanup
* update applying padto to new idx
* add unit tests
* cleanup
* fold line
* improve spec
* dont try to render Invalid as a float
* more consistent invalid index
* update some tests
* Fold index with true cond
* skip test
* vconst min max if Invalid in arg
* fix signature of UOp.const
* add test for min/max of Invalid CONST/VCONST
* add InvalidType to as_const signature
* is Invalid to isinstance
* Add InvalidType to ConstLike
* index gate is a where gate
* make that a metaclass
* fix heurisics for new idx
* mypy happy
