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

[Chen Liang]

On Sat, 17 Jan 2026 01:15:22 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> generate null checks for field use sites depending on a compiler option, see also [1] which did a similar thing for method invocations
>> 
>> [1] https://github.com/openjdk/valhalla/pull/1910
>
> Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:
> 
>   changes to test

Marked as reviewed by liach (Committer).

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PR Review: https://git.openjdk.org/valhalla/pull/1926#pullrequestreview-3676187257