[clang] [Sema] Improve diagnostic for volatile static data member initializer… (PR #185021)

[via cfe-commits]

Lnkqwq wrote:

@zwuis I couldn't find any indication in this issue that it's been fixed. Could you share the PR number or the specific commit that fixed it?
If there's a fix that I missed, please point me to it so I can learn. Otherwise, this PR (#你的PR号) addresses the issue.

https://github.com/llvm/llvm-project/pull/185021