RFR: 8280035: Use Class.isInstance instead of Class.isAssignableFrom where applicable

[ExE Boss]

On Mon, 21 Feb 2022 12:16:53 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Method `isAssignableFrom` is opposite: it brings unnecessary complexity in the code. And it's easy to confuse orders of parameters. Even JBS confirms that:

Maybe we should add `Class::isSubclassOf(Class<?> that)` that performs `that.isAssignableFrom(this)`:

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PR: https://git.openjdk.java.net/jdk/pull/7061