RFR: add use site null checks [v9]

[Vicente Romero]

On Fri, 16 Jan 2026 14:06:25 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> Adding use site null checks for method invocations. They are added by default but if option: `noUseSiteNullChecks` is passed, the compiler won't generate them
>
> Vicente Romero has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Apply suggestion from @vicente-romero-oracle
>  - last change

src/jdk.compiler/share/classes/com/sun/tools/javac/comp/NullChecksWriter.java line 221:

> 219:         /* now add the last vararg argument if applicable, no checks are needed here as varargs can't be
> 220:          * null restricted. Also note that at this point the vararg arguments have already been translated
> 221:          * by Lower into an array. This is not true for signature polymorphic methods but we have already

Suggestion:

         * by Lower into an array. This is not true for signature polymorphic methods, but we have already

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1910#discussion_r2698649582