[JDK-8248862] Implement Enhanced Pseudo-Random Number Generators - Java Bug System

Integrate Guy Steele's Pseudo-Random Number Generator work into the JDK.

csr for

JDK-8255395 Implement Enhanced Pseudo-Random Number Generators

relates to

JDK-8265137 java.util.Random suddenly has new public methods nowhere documented

JDK-8264791 java/util/Random/RandomTestBsi1999.java failed "java.security.SecureRandom nextFloat consecutive"

JDK-8264976 Minor numeric bug in AbstractSplittableWithBrineGenerator.makeSplitsSpliterator

JDK-8275821 Optimize random number generators developed in JDK-8248862 using Math.unsignedMultiplyHigh()

JDK-8315973 Remove unused fields from ThreadLocalRandom

JDK-8054807 (rand) Random.nextDouble() should be more uniform

JDK-8282551 Properly initialize L32X64MixRandom state

links to

Commit openjdk/jdk/a0ec2cb2

Review openjdk/jdk/1273

Review openjdk/jdk/1292

(3 relates to, 4 links to)