This MR introduces some additions and fixes for generating CPU loops with step sizes > 1:
The CPU create_kernel function now exposes a flag to disable the double field write check
Rewrote get_base_buffer_index to use pure integer arithmetic, and corrected the computation of the buffer base index
to correctly incorporate loop step sizes. Added test case to check correctness.
Added rudimentary evalf functionality to integer division sympy function int_div (its absence lead to an infinite recursion during code generation).
Added correct printing of integer-typed expressions in CustomSympyPrinter._typed_number.
