RFR(S): 8062543: Replace uses of MethodHandleImpl.castReference with Class.cast

[Michael Haupt]

Dear all,

please review and sponsor this change.
RFE: https://bugs.openjdk.java.net/browse/JDK-8062543
Webrev: http://cr.openjdk.java.net/~mhaupt/8062543/webrev.00/

The change removes the no longer needed MethodHandleImpl.castReference method. Its uses are replaced with Class.cast.

Tested with:
* jtreg (java.lang.invoke, java.util.stream)
* JPRT (hotspot and jdk_lang test sets)
* UTE (vm.quick-pcl.testlist, vm.defmeth.testlist)

Thanks,

Michael

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