pytorch

1ef0def8 - [LTC] Change Shape.at_element_type_ to Shape.scalar_type_

[LTC] Change Shape.at_element_type_ to Shape.scalar_type_ Summary: This commit changes Shape.at_element_type_ to Shape.scalar_type_ as one step to refactor class Shape. Test Plan: lazy_tensor_core/test/cpp/build/test_ptltc