RFR: 8282551: Properly initialize L32X64MixRandom state

[Devin Smith]

Did a cursory review of the other generators, they seem to set the state correctly.

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Commit messages:
 - [PATCH] Properly initialize L32X64MixRandom state

Changes: https://git.openjdk.java.net/jdk/pull/7120/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7120&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282551
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7120.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7120/head:pull/7120

PR: https://git.openjdk.java.net/jdk/pull/7120