Add CHANGES.md entry for AES-CBC AVX-512/VAES decryption

Document the AVX-512 and VAES optimizations for AES-CBC decryption,
which improve decryption performance for large inputs (1024 bytes or
more) by 3.5x to 3.8x.

Reviewed-by: Simo Sorce <simo@redhat.com>
Reviewed-by: Andrew Dinh <andrewd@openssl.org>
MergeDate: Fri Jul 31 16:33:42 2026
(Merged from openssl#30902)

Author: madanm3

CHANGES.md

@@ -262,6 +262,11 @@ OpenSSL Releases
 
    *Helen Zhang*
 
+ * Added AVX-512 and VAES optimizations for AES-CBC decryption. Decryption
+   performance for large inputs (1024 bytes or more) improved by 3.5x to 3.8x.
+
+   *Madan Mohan Manokar*
+
  * Deprecated `ASN1_BIT_STRING_set()` in favour of `ASN1_BIT_STRING_set1()`.
 
    *Norbert Pócs*