* [ARITH] Simplify casts of constants 0 and 1

* [EXPR] is_const_value to check whether non-ints are consts

* Revert "[EXPR] is_const_value to check whether non-ints are consts"

This reverts commit 7e1b3462e3f74fd0afb1541d72978107cfa23c30.

* Use tvm::cast