RFR: 8273341: Update Siphash to version 1.0 [v2]

[Coleen Phillimore]

On Fri, 19 Nov 2021 20:59:40 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> The SipHash hash function that we use for rehashing had an update to avoid a strict aliasing violation.  We compile with anti-aliasing, so it's not a problem for Hotspot, but the fix is made to keep us consistent.
>> 
>> Tested with tier1-3 and special test cases for original issue.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update the SipHash copyright to match current sources.

David, thanks for the code review.

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PR: https://git.openjdk.java.net/jdk/pull/6482