Enable stdarch_x86_avx512 for cpu has avx512bw (#1551)

Author: serendipity-crypto

src/lib.rs

@@ -49,6 +49,10 @@
 #![doc(test(attr(allow(unused_variables), deny(warnings))))]
 #![no_std]
 #![cfg_attr(feature = "simd_support", feature(portable_simd))]
+#![cfg_attr(
+    all(feature = "simd_support", target_feature = "avx512bw"),
+    feature(stdarch_x86_avx512)
+)]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 #![allow(
     clippy::float_cmp,