RFR 8228675: Resolve.findMethod doesn't cache interface type calculation

[Ron Shapiro]

Hi,

Please review this change to speed up Resolve.findMethod for large classes
that have large numbers of (super)interfaces

webrev: http://cr.openjdk.java.net/~ronsh/8228675/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8228675

Thanks,
Ron
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