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

[Vassil Vassilev via cfe-commits]

https://github.com/vgvassilev commented:

This patch does too many things for me to be able to review it. This patch fails on our infrastructure.

I'd propose to simplify it to basically D41416 + the on-disk hash table. We should read all of the entries upon module loading to simplify the logic in reading the hashes lazily. Reading the hashes lazily could be done but I doubt its worth the complexity of the implementation at that stage.

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