RFR: 8289227: Support for BCP 47 Extension T - Transformed Content [v5]

[Joe Wang]

On Fri, 29 Jul 2022 23:27:53 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> This PR is to propose supporting the `T` extension to the BCP 47 to which `java.util.Locale` class conforms. There are two extensions to the BCP 47, one is `Unicode Locale Extension` which has been supported since JDK7, the other is this `Transformed Content` extension. A CSR has also been drafted.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Parse invalid fields correctly

test/jdk/java/util/Locale/bcp47/TExtensionTests.java line 190:

> 188:         } catch (IllformedLocaleException ile) {
> 189:             // success
> 190:             System.out.println("IllformedLocaleException thrown correctly: " + ile.getMessage());

Could use assertThrows, but ok if you want to keep it this way.

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PR: https://git.openjdk.org/jdk/pull/9620