RFR: 8156835: [JVMCI] clean up and minimize JVMCI

[Igor Veresov]

Looks ok

igor

> On May 13, 2016, at 4:40 AM, Doug Simon <doug.simon at oracle.com> wrote:
> 
> Please review this RFE that makes minor changes to clean up and minimize JVMCI.
> 
> All jtreg tests pass as do all Graal tests.
> 
> https://bugs.openjdk.java.net/browse/JDK-8156835
> http://cr.openjdk.java.net/~dnsimon/8156835
> 
> -Doug