[llvm] [ThinLTO] Populate declaration import status except for distributed ThinLTO under a default-off new option (PR #88024)

[Mingming Liu via llvm-commits]

minglotus-6 wrote:

I had tested the proof-of-concept (along with https://github.com/llvm/llvm-project/pull/87600 and declaration import) on internal large workloads. I'll do a sanity check with the reviewed one and land this after that.

https://github.com/llvm/llvm-project/pull/88024