RFR: 8311943: Cleanup usages of toLowerCase() and toUpperCase() in java.base [v3]

[Glavo]

On Tue, 15 Aug 2023 10:48:29 GMT, Glavo <duke at openjdk.org> wrote:

>> Clean up misuses of `toLowerCase()`/`toUpperCase()` in java.base.
>
> Glavo has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:
> 
>  - Merge remote-tracking branch 'origin/master' into case-conversion-java-base
>  - Revert StreamTokenizer.java
>  - Update DateTimeFormatterBuilder
>  - Avoid locale-sensitive case conversions in java.base

I updated this PR to resolve the merge conflict. Now it is waiting to be reviewed again.

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PR Comment: https://git.openjdk.org/jdk/pull/14763#issuecomment-1678743922