RFR(L): 8139885: implement JEP 274: enhanced method handles

[Michael Haupt]

Dear all,

please review this change.
RFE: https://bugs.openjdk.java.net/browse/JDK-8139885
Corresponding JEP: https://bugs.openjdk.java.net/browse/JDK-8130227
Webrev: http://cr.openjdk.java.net/~mhaupt/8139885/webrev.00/

Thanks,

Michael

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