RFR: 8267110: Update java.util to use instanceof pattern variable

[Doug Lea]

On Tue, 18 May 2021 10:37:21 GMT, Patrick Concannon <pconcannon at openjdk.org> wrote:

> Hi,
> 
> Could someone please review my code for updating the code in the `java.util` package to make use of the `instanceof` pattern variable?
> 
> Kind regards,
> Patrick

Because we still make jdk11-compatible test-release java.util.concurrent jars, we are not big fans of adding non-essential differences to openjdk version. But if there is some advantage to doing this, we'll cope.

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PR: https://git.openjdk.java.net/jdk/pull/4088