RFR: JDK-8153273: Test lib compilations trigger find crash on Solaris

[Tim Bell]

Erik:

> As reported in JDK-8142906, find may crash when building the test-lib 
> jars. This is caused by two SetupJavaCompilation setups putting their 
> classes in the same directory. There is really no reason for them to 
> do that so the fix is to use separate directories.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8153273
> Webrev: http://cr.openjdk.java.net/~erikj/8153273/webrev.01/

Looks good to me.

/Tim