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

[Doug Simon]

Great - thanks for reviewing!

> On 13 May 2016, at 20:02, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> 
> Looks good.
> 
> thanks,
> Vladimir
> 
> On 5/13/16 4:40 AM, Doug Simon 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
>>