RFR (XS): 8030680: 292 cleanup from default method code assessment

[Michael Haupt]

Hello,

please review and sponsor this change, and ignore the erroneous post on core-libs-dev.
RFE: https://bugs.openjdk.java.net/browse/JDK-8030680
Webrev: http://cr.openjdk.java.net/~mhaupt/8030680/webrev.00/

This is a set of simple changes to increase robustness. Tested locally with jtreg for java.lang.invoke, and with JPRT using the hotspot test set.

Thanks,

Michael

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