[jdk15u-dev] Integrated: 8273341: Update Siphash to version 1.0

[Yuri Nesterenko]

I'd like to backport it to 15u where there is the previous version, too. The patch applies cleanly, hotspot/runtime tests run OK.

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Commit messages:
 - Backport 6cf4cd1aa46414d9af17f3704b27d0d381a17ee8

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/160/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=160&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273341
  Stats: 22 lines in 2 files changed: 7 ins; 0 del; 15 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/160.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/160/head:pull/160

PR: https://git.openjdk.java.net/jdk15u-dev/pull/160