RFR: 8282756: Make ElementKind checks more specific

[Pavel Rappo]

On Tue, 8 Mar 2022 18:01:18 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> `Utils.isClass` and `Utils.isInterface` seem inconsistent. We should try and come up with consistent patterns for "is any class", "is exactly class", "is interface", "is exactly interface"

They are inconsistent, but this PR hasn't made them so. I think we should come up with better names in a later PR.

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PR: https://git.openjdk.java.net/jdk/pull/7747