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

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> > > [do not merge] [runtime-cxxmodules] Rework our lazy template specialization deserialization mechanism [root-project/root#14495](https://github.com/root-project/root/pull/14495)
> > 
> > 
> > From [root-project/root#14495](https://github.com/root-project/root/pull/14495), I see there is new reply saying the testing is actually fine. Do you think we still need to split the patch?
> 
> That comment was concerning the version of the patch that had the lazy template deserialization turned off by default. Yes, I still think that this patch should implement tha on-disk hash table on top of D41416

OK. And would you like to send a PR for D41416? I've already fixed the issue mentioned in the review page. Then I'd like to send small and incremental patches on that.

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