[jdk15u-dev] RFR: 8251260: two MD5 tests fail "RuntimeException: Unexpected count of intrinsic"

[Paul Hohensee]

I'd like to backport this as a necessary follow-up to [JDK-8280978](https://bugs.openjdk.java.net/browse/JDK-8280978), which latter is the 15u backport of [JDK-8250902](https://bugs.openjdk.java.net/browse/JDK-8250902).

Applies cleanly, test-only fix that disables MD5/SHA tests for AOT.

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Commit messages:
 - Backport 1ad165941313bbaa9e886946081c321f35374f6e

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/166/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=166&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251260
  Stats: 31 lines in 9 files changed: 24 ins; 7 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/166.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/166/head:pull/166

PR: https://git.openjdk.java.net/jdk15u-dev/pull/166