New EA build

[Ron Pressler]

The builds at the Project Loom Early Access page [1] have been refreshed. The
latest builds are based on jdk-16+10 (JDK 16 build 10).

There are several important stability fixes in this build (there are more to
come; there are still stability issues). This build has initial support for ZGC,
it's just not as stable as G1 right now as most of the testing has been on G1.
There is new instrinic for Thread.currentThread and also several
changes/improvements in the libraries to work better with virtual threads.

- Ron

[1] http://jdk.java.net/loom/