Some small bug fixes

Author: sterrettm2

src/avx2-32bit-common.h

@@ -558,7 +558,7 @@ inline int64_t replace_nan_with_inf(float *arr, int64_t arrsize)
         __m256 in_ymm = ymm_vector<float>::maskz_loadu(loadmask, arr);
         __m256i nanmask = _mm256_castps_si256(
                 _mm256_cmp_ps(in_ymm, in_ymm, _CMP_NEQ_UQ));
-        nan_count += _popcnt32(avx2_mask_helper32(nanmask));
+        nan_count += _mm_popcnt_u32(avx2_mask_helper32(nanmask));
         ymm_vector<float>::mask_storeu(arr, nanmask, YMM_MAX_FLOAT);
         arr += 8;
         arrsize -= 8;

src/xss-common-qsort.h

@@ -944,6 +944,7 @@ void avx2_qselect(T *arr, int64_t k, int64_t arrsize, bool hasnan = false)
             indx_last_elem = move_nans_to_end_of_array(arr, arrsize);
         }
     }
+    UNUSED(hasnan);
     if (indx_last_elem >= k) {
         qselect_<xss::avx2::ymm_vector<T>, T>(
                 arr, k, 0, indx_last_elem, 2 * (int64_t)log2(indx_last_elem));