[PATCH 1/1] Improved ripemd160 performance

[And Sch]

The benchmarks on different systems:

Intel(R) Atom(TM) CPU N570   @ 1.66GHz
before:
Hash:
                |  nanosecs/byte   mebibytes/sec   cycles/byte
 RIPEMD160      |     13.07 ns/B     72.97 MiB/s         - c/B
after:
Hash:
                |  nanosecs/byte   mebibytes/sec   cycles/byte
 RIPEMD160      |     11.37 ns/B     83.84 MiB/s         - c/B

Intel(R) Core(TM) i5-4670 CPU @ 3.40GHz
before:
Hash:
                |  nanosecs/byte   mebibytes/sec   cycles/byte
 RIPEMD160      |      3.31 ns/B     288.0 MiB/s         - c/B
after:
Hash:
                |  nanosecs/byte   mebibytes/sec   cycles/byte
 RIPEMD160      |      2.08 ns/B     458.5 MiB/s         - c/B

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