RFR(S): 8218991: s390: Add intrinsic for GHASH algorithm

[Doerr, Martin]

Hi,

I'd like to contribute a GHASH stub for s390 to fix a SSL performance bottleneck.

Webrev:
http://cr.openjdk.java.net/~mdoerr/8218991_s390_ghash/webrev.00/

TestAESMain improves by about factor 3 with the following setup on z13 hardware: algorithm=AES, mode=GCM, paddingStr=PKCS5Padding, msgSize=12000, keySize=128, noReinit=false, checkOutput=false, encInputOffset=0, encOutputOffset=0, decOutputOffset=0, lastChunkSize=32

Please review.

Best regards,
Martin

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