RFR: 8341399: Add since checker tests to the langtools modules [v2]

[Nizar Benalla]

On Fri, 1 Nov 2024 15:36:59 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

>> test/jdk/tools/sincechecker/jdk_compiler/CheckSince_jdkCompiler.java line 27:
>> 
>>> 25:  * @test
>>> 26:  * @bug 8341399
>>> 27:  * @summary Test for `@since` for java.base module
>> 
>> You forgot to change the summaries but remembered to change the `@run` directives. Curious!
>
> Nice catch! I'll update them

Fixed and also added a test for `jdk.jshell`

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PR Review Comment: https://git.openjdk.org/jdk/pull/21542#discussion_r1825978307