[jdk11u-dev] RFR: 8250902: Implement MD5 Intrinsics on x86

[Paul Hohensee]

I'd like to backport MD5 intrinsification because it improves security related performance. I understand that it may be a bridge too far for 11u. In that case we (Amazon) intend to backport it to our internal 11u distro followed by Corretto.

Testing: tier1, including the new and existing sha tests.

Ludovic Henry did an 11u backport in 2020 (see [JDK-8251319](https://bugs.openjdk.java.net/browse/JDK-8251319)), but I can't find a review request on the jdk-updates-dev list. My backport is essentially identical to his, and is based on the [backport from jdk15u](https://github.com/openjdk/jdk15u-dev/pull/163). It was not clean.

1. Copyright date conflicts.
2. Context differences.
3. Changing SHAOptionsBase to DigestOptionsBase.
4. Rewriting Assembler::roll() to use emit_int8() because emit_int16() and emit_24() don't exist in 11.

This backport would be immediately followed by a backport of [JDK-8251260](https://bugs.openjdk.java.net/browse/JDK-8251260) to fix two tests. After that, I'd like to backport the aarch64 version in [JDK-8251216](https://bugs.openjdk.java.net/browse/JDK-8251216).

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Commit messages:
 - Backport 339016a0f2cbbbbc3560e50c6726e14afbf547f6

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/806/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=806&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8250902
  Stats: 1983 lines in 57 files changed: 1193 ins; 457 del; 333 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/806.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/806/head:pull/806

PR: https://git.openjdk.java.net/jdk11u-dev/pull/806