[lld] [LLD] Deprecate --lto-basic-block-sections=labels. (PR #110697)

[Fangrui Song via llvm-commits]

https://github.com/MaskRay approved this pull request.

This option is used in very specific cases. You can delete this very soon.

(The majority of patches don't have a trailing period in the subject.)

You can also replace `. Please` with `; `

https://github.com/llvm/llvm-project/pull/110697