RFR 8210483: AssertionError in DeferredAttr at setOverloadKind caused by JDK-8203679

[Liam Miller-Cushon]

Hi,

This change fixes a regression introduced by the fix for JDK-8203679.

I left a comment on the bug with my diagnosis of the crash:
https://bugs.openjdk.java.net/browse/JDK-8210483?focusedCommentId=14209494&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14209494

bug: https://bugs.openjdk.java.net/browse/JDK-8210483
webrev: http://cr.openjdk.java.net/~cushon/8210483/webrev.00/
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