[11u] RFR[M]: 8250902: Implement MD5 Intrinsics on x86

[Ludovic Henry]

Hello,

I would like to backport the newly added MD5 Intrinsic to JDK 11. The change is contained, limiting the chance of a regression, and provides a great speedup on a common pattern. This change also contains the follow-up fix by Vladimir Kozlov.

As it is the first backport I go through, please let me know what other steps I need to take.

Original Bugs:
https://bugs.openjdk.java.net/browse/JDK-8250902
https://bugs.openjdk.java.net/browse/JDK-8251260

Original Webrevs:
http://cr.openjdk.java.net/~luhenry/8250902/webrev.03
http://cr.openjdk.java.net/~kvn/8251260/webrev.00/

Bug:
https://bugs.openjdk.java.net/browse/JDK-8251319

Webrev:
http://cr.openjdk.java.net/~luhenry/8250902-11u/webrev.00

Testing: Linux-x64, fastdebug, test/hotspot/jtreg/compiler/intrinsics/sha, hotspot:tier1, jdk:tier1.

Thank you,
Ludovic

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