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[S390x] Optimize SHA256 and SHA512 compress functions

Maamoun TK requested to merge mamonet/nettle:s390x-sha1 into master

This patch optimizes SHA256 and SHA512 compress functions for s390x architecture, the testsuite passes the tests. Benchmark on Z15:

Algorithm C Hardware-accelerated
SHA265 242.76 Mbyte/s 869.00 Mbyte/s
SHA512 373.18 Mbyte/s 1555.21 Mbyte/s

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