rijndael-ssse3: move assembly functions to separate source-file
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rijndael-ssse3: move assembly functions to separate source-file

* cipher/Makefile.am: Add 'rinjdael-ssse3-amd64-asm.S'.
* cipher/rinjdael-ssse3-amd64-asm.S: Moved assembly functions
here ...
* cipher/rinjdael-ssse3-amd64.c: ... from this file.
(_gcry_aes_ssse3_enc_preload, _gcry_aes_ssse3_dec_preload)
(_gcry_aes_ssse3_shedule_core, _gcry_aes_ssse3_encrypt_core)
(_gcry_aes_ssse3_decrypt_core): New.
(vpaes_ssse3_prepare_enc, vpaes_ssse3_prepare_dec)
(_gcry_aes_ssse3_do_setkey, _gcry_aes_ssse3_prepare_decryption)
(do_vpaes_ssse3_enc, do_vpaes_ssse3_dec): Update to use external
assembly functions; remove 'aes_const_ptr' variable usage.
(_gcry_aes_ssse3_encrypt, _gcry_aes_ssse3_decrypt)
(_gcry_aes_ssse3_cfb_enc, _gcry_aes_ssse3_cbc_enc)
(_gcry_aes_ssse3_ctr_enc, _gcry_aes_ssse3_cfb_dec)
(_gcry_aes_ssse3_cbc_dec, ssse3_ocb_enc, ssse3_ocb_dec)
(_gcry_aes_ssse3_ocb_auth): Remove 'aes_const_ptr' variable usage.
* configure.ac: Add 'rinjdael-ssse3-amd64-asm.lo'.

After this change, libgcrypt can be compiled with -flto optimization
enabled on x86-64.

(cherry picked from commit 54c57bc49edb5c00e9ed8103cc4837bb72c5e863)