[clang] [clang-tools-extra] [clang-tidy] [dataflow] Cache reference accessors for `bugprone-unchecked-optional-access` (PR #128437)

[Jan Voung via cfe-commits]

jvoung wrote:

> Addressed all comments. Thanks for the initial feedback!
> 
> Regarding documentation: looks like we need to merge #122290 first and then update docs in my PR

Thanks for the reminder about #122290 ! Got back to that and merged. Can you update? It looked like the latest release notes had more entries under "Changes in existing checks" like "bugprone-unsafe-functions" ?

https://github.com/llvm/llvm-project/pull/128437