The usual story when I change Thread.java is that I'm missing something and I end up reverting, so I was extra careful this time.
8200122: Remove unused field Thread.threadQ http://cr.openjdk.java.net/~martin/webrevs/jdk/Thread-threadQ/ https://bugs.openjdk.java.net/browse/JDK-8200122 8200123: Replace Thread.init with telescoping constructor http://cr.openjdk.java.net/~martin/webrevs/jdk/Thread-init/ https://bugs.openjdk.java.net/browse/JDK-8200123
