* cipher/cipher-gcm-ppc.c (asm_xor, asm_mergelo, asm_mergehi)
(vec_be_swap, vec_load_he, vec_store_he): New.
(vec_load_be, vec_perm2, vec_aligned_st, vec_aligned_ld): Remove.
(asm_vpmsumd, asm_swap_u64, vec_perm2, asm_rot_block_left)
(asm_rot_block_right, asm_ashl_128, vec_aligned_ld)
(_gcry_ghash_setup_ppc_vpmsum): Update 'bswap_const'.
(_gcry_ghash_ppc_vpmsum): Update 'bswap_const'; Use 'asm_mergehi'
and 'asm_mergelo' instead of vec_perm2; Use 'asm_xor' for
fast path to enforce instruction ordering; Use 'vec_load_he' and
'vec_be_swap' for big-endian loads.

|  nanosecs/byte   mebibytes/sec   cycles/byte

|  nanosecs/byte   mebibytes/sec   cycles/byte