RFR: add use site null checks for fields [v5]

[Vicente Romero]

On Mon, 19 Jan 2026 10:21:07 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   changes to test
>
> src/jdk.compiler/share/classes/com/sun/tools/javac/comp/NullChecksWriter.java line 179:
> 
>> 177: 
>> 178:         private Symbol outermostType(Symbol sym) {
>> 179:             Symbol prev = null;
> 
> Doesn't `sym.outermostClass()` work?

it work but at the end it does a cast to ClassSymbol, unfortunately some fields can have TypeSymbol as its outermost class. This is use in Symtab, an anonymous class of TypeSymbol and the build was failing

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1926#discussion_r2704628434