RFR: 8263668: Update java.time to use instanceof pattern variable [v6]

[Patrick Concannon]

On Wed, 21 Apr 2021 09:06:45 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Patrick Concannon has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Updated single letter pattern variable names
>
> src/java.base/share/classes/java/time/Duration.java line 723:
> 
>> 721:         }
>> 722:         if (unit instanceof ChronoUnit u) {
>> 723:             switch (u) {
> 
> Maybe `u` could be replaced with `chronoUnit` here too

Variable name updated as suggested in 3dc1e07

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PR: https://git.openjdk.java.net/jdk/pull/3170