RFR: 8064846: Lazy-init thread safety problems in core reflection

[Martin Buchholz]

Hi Joel, Joe, Paul,

I'd like you to do a code review.

http://cr.openjdk.java.net/~martin/webrevs/openjdk9/core-reflection-volatile/
https://bugs.openjdk.java.net/browse/JDK-8064846