RFR(S) : 8180037 : move jdk.test.lib.InMemoryJavaCompiler to a separate package

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8180037/webrev.00/index.html
> 41 lines changed: 3 ins; 13 del; 25 mod;

Hi all,

could you please review this small patch which moves jdk.test.lib.InMemoryJavaCompiler to  jdk.test.lib.compiler package and updates the tests?
InMemoryJavaCompiler depends on java.compiler module, so in order to avoid unneeded module dependency it should be moved to a separate package.

webrev: http://cr.openjdk.java.net/~iignatyev//8180037/webrev.00/index.html
JBS: https://bugs.openjdk.java.net/browse/JDK-8180037
testing: :hotspot_all

Thanks,
-- Igor