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

[Coleen Phillimore]

> 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.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6482/files
  - new: https://git.openjdk.java.net/jdk/pull/6482/files/53ad9ebb..a9e11deb

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6482&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6482&range=00-01

  Stats: 17 lines in 1 file changed: 5 ins; 0 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6482.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6482/head:pull/6482

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