[clang] [Serialization] Load Specializations Lazily (PR #76774)

[Ilya Biryukov via cfe-commits]

ilya-biryukov wrote:

Sorry for losing track of the discussion here. What is the current status here? Should we run another round of testing?

Also, I see proposals to land the new behaviour under a flag and have it off by default.
If that does not add a lot of complexity, that would definitely be something that's makes testing easier on our side. Our compiler is build from revisions close to head and don't need to wait for the next Clang release to rip the benefits of this approach.

https://github.com/llvm/llvm-project/pull/76774