[clang] [Clang] fix assertion failure in invalid delete operator declaration check (PR #99308)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> @AaronBallman If no further feedback is needed, could you please proceed with the merge? Thanks

Can do! Btw, you should feel free to obtain commit privileges yourself if you'd like: https://llvm.org/docs/DeveloperPolicy.html#obtaining-commit-access

https://github.com/llvm/llvm-project/pull/99308