[lldb] [llvm] [lldb-dap][NFC] Add Breakpoint struct to share common logic. (PR #80753)

[Zequan Wu via llvm-commits]

ZequanWu wrote:

I uploaded https://github.com/llvm/llvm-project/pull/81541 as reference for reviewers to understand the motivation of this patch.

https://github.com/llvm/llvm-project/pull/80753