Update fir int

[tancheng]

Provide fir int kernel

• Update fir kernel test accordingly
• No alloc needed

@Jackcuii plz check the generated mapping and IR. It has II=5, which is easier for you to parsing. And I update the data type as integer, so you don't need to change types.

[YanzhouTang]

NOTES: if we still encounter the vectorization, it is due to the pragma in https://github.com/tancheng/CGRA-Bench/blob/master/kernels/fir/fir.cpp Line37. The #pragma clang loop unroll_count(4) vectorize_width(4) could make -fno-vectorize not take effect.