RFR 8195650 Method references to VarHandle accessors

[Paul Sandoz]

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.