[jdk11u-dev] RFR: 8240734: ModuleHashes attribute not reproducible between builds

[Christoph Langer]

8240734: ModuleHashes attribute not reproducible between builds

This is a clean backport of JDK-8240734. I'm backporting this as a predecessor of JDK-8243666.

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Commit messages:
 - 8240734: ModuleHashes attribute not reproducible between builds

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/915/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=915&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8240734
  Stats: 6 lines in 2 files changed: 2 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/915.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/915/head:pull/915

PR: https://git.openjdk.java.net/jdk11u-dev/pull/915