The CPU with ARM architecture failed to run `env_setup.py`.

[Heht571]

The CPU with ARM architecture failed to run env_setup.py. Make the following modifications:

1. Change the code from

posix_memalign(&ptr, 64, size);
return ptr;

to

if posix_memalign(&ptr, 64, size) != 0:
    return nullptr;

2. Change the code from

vec_c[{6}] += vec_v_left_{0}.val[0];
vec_c[{6}] += vec_v_right_{0}.val[0];
vec_c[{7}] += vec_v_left_{0}.val[1];
vec_c[{7}] += vec_v_right_{0}.val[1];

to

vec_c[{6}] = vaddq_s16(vec_c[{6}], vmovl_s8(vget_low_s8(vec_v_left_{0}.val[0])));
vec_c[{6}] = vaddq_s16(vec_c[{6}], vmovl_s8(vget_low_s8(vec_v_right_{0}.val[0])));
vec_c[{7}] = vaddq_s16(vec_c[{7}], vmovl_s8(vget_low_s8(vec_v_left_{0}.val[1])));
vec_c[{7}] = vaddq_s16(vec_c[{7}], vmovl_s8(vget_low_s8(vec_v_right_{0}.val[1])));

3. Change the code from

const int8x16_t vec_zero = vdupq_n_s16(0x0000);

to

const int16x8_t vec_zero = vdupq_n_s16(0x0000);

After modification, it can be successful

[Benjamin-Wegener]

https://github.com/microsoft/BitNet/issues/240