RFR 10: JDK-8161207: Remove extra MethodHandle subclass in MethodHandleImpl

[Ron Pressler]

Hi.

Please review,
Bug: https://bugs.openjdk.java.net/browse/JDK-8161207
 <https://bugs.openjdk.java.net/browse/JDK-8161207>Webrev: http://cr.openjdk.java.net/~rpressler/jdk10/JDK-8161207-intrinsicmethodhandle/webrev/ <http://cr.openjdk.java.net/~rpressler/jdk10/JDK-8161207-intrinsicmethodhandle/webrev/>

The goal of this issue is to simplify code by removing the MethodHandleImpl.IntrinsicMethodHandle class. However, we’re not quite there yet, and the proposed change is an interim measure. The intrinsic is now stored as a field in LambdaForm.NamedFunction, but IntrinsicMethodHandle is still used. An assertion in NamedFunction’s constructor verifies that the intrinsic passed to NamedFunction matches that used in IntrinsicMethodHandle.

Ron