[jdk13u-dev] RFR: 8273341: Update Siphash to version 1.0

[Yuri Nesterenko]

the previous version is identical to that in 15u, thus the patch applies cleanly, too. Tests hotspot/runtime pass OK.

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Commit messages:
 - Backport 6cf4cd1aa46414d9af17f3704b27d0d381a17ee8

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/313/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=313&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/jdk13u-dev/pull/313.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/313/head:pull/313

PR: https://git.openjdk.java.net/jdk13u-dev/pull/313