RFR: 8263358: Update java.lang to use instanceof pattern variable [v5]

[Patrick Concannon]

On Tue, 16 Mar 2021 19:26:35 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> `declaringClass` is a string representing the class name (not the `Class` object).   The variable name indeed causes confusion.
>
> Doh. My mistake. Was thinking about `StackFrame`. Thanks Mandy!

I've reordered the checks as suggested and the updated code can be found in commit b89027c

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PR: https://git.openjdk.java.net/jdk/pull/2913