RFR: Here are some Thread cleanup patches

[Martin Buchholz]

On Tue, Mar 27, 2018 at 6:24 PM, Martin Buchholz <martinrb at google.com>
wrote:

>  At least the VM doesn't have to run any risky java code
>

??  Why is Martin so sure ??
Let's check:

java -Xlog:class+load=trace -version |& grep -Ew 'annotation|lang.Thread'
[0.010s][info ][class,load] java.lang.Thread source: jrt:/java.base
[0.010s][info ][class,load] java.lang.Thread$UncaughtExceptionHandler
source: jrt:/java.base
[0.012s][info ][class,load] java.lang.annotation.Annotation source:
jrt:/java.base

So Stable does __not__ have to be class-loaded when Thread is class-loaded.