RFR 8195650 Method references to VarHandle accessors

[John Rose]

Good fix. Reviewed. 

> On Jun 25, 2018, at 9:11 AM, Paul Sandoz <paul.sandoz at oracle.com> wrote:
> 
> Gentle reminder.
> 
> I would like to get this reviews and pushed before the ramp down phase one kicks in this week.
> 
> Paul.
> 
>> On Jun 19, 2018, at 5:08 PM, Paul Sandoz <Paul.Sandoz at oracle.com> wrote:
>> 
>> Hi,
>> 
>> Please review the following fix to ensure method references to VarHandle signature polymorphic methods are supported at runtime (specifically the method handle to a signature polymorphic method can be loaded from the constant pool):
>> 
>> http://cr.openjdk.java.net/~psandoz/jdk/JDK-8195650-varhandle-mref/webrev/ <http://cr.openjdk.java.net/~psandoz/jdk/JDK-8195650-varhandle-mref/webrev/>
>> 
>> I also added a “belts and braces” test to ensure a constant method handle to MethodHandle::invokeBasic cannot be loaded if outside of the j.l.invoke package.
>> 
>> Paul.
>> 
>