rinjdael: add parallel processing for CFB decryption with AES-NI
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rinjdael: add parallel processing for CFB decryption with AES-NI

* cipher/cipher-selftest.c (_gcry_selftest_helper_cfb_128): New
function for CFB selftests.
* cipher/cipher-selftest.h (_gcry_selftest_helper_cfb_128): New
prototype.
* cipher/rijndael.c [USE_AESNI] (do_aesni_enc_vec4): New function.
(_gcry_aes_cfb_dec) [USE_AESNI]: Add parallelized CFB decryption.
(selftest_cfb_128): New function.
(selftest): Call selftest_cfb_128.

CFB decryption can be parallelized for additional performance. On Intel
Sandy-Bridge processor, this change makes CFB decryption 4.6 times faster.