RFR: Remove redundant null checks [v5]

[Maurizio Cimadamore]

On Fri, 23 Jan 2026 02:27:07 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> some of the null checks javac generates are redundant and can be removed
>
> Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:
> 
>   adding more tests

src/jdk.compiler/share/classes/com/sun/tools/javac/comp/NullChecksWriter.java line 213:

> 211: 
> 212:         private boolean isInThisSameCompUnit(Symbol sym) {
> 213:             return env.toplevel.getTypeDecls().stream()

Isn't this the same as `env.enclClass.sym.outermostClass() == sym.outermostClass()` ?

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1947#discussion_r2720554393