_self_host_simd_i32_test.nx

_self_host_simd_i32_test.nx -- i32x8 set: 5 ops verified. Refactored 2026-05-17 to current parse.c SIMD intrinsic API: __simd_vbroadcast_i32_x8(scalar) -> vec __simd_vadd_i32_x8(a_vec, b_vec) -> vec __simd_vsub_i32_x8(a_vec, b_vec) -> vec __simd_vmul_i32_x8(a_vec, b_vec) -> vec __simd_vstore_i32_x8(vec, ptr) -> 0 (writes 32 bytes) __simd_vreduce_sum_i32_x8(vec) -> i64 sum across lanes