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

[Vassil Vassilev via cfe-commits]

vgvassilev 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.
> > > > > 
> > > > > 
> > > > > Do you mean that I should open a PR for D41416 and you will apply your patch there? I have no problem if we do everything here as part of this PR. This way we will have the full history of how this was born in one place ;)
> > > > 
> > > > 
> > > > Yeah, and please create a branch under llvm/llvm-project directly. Then I can perform stacked PR on that.
> > > 
> > > 
> > > There it is: https://github.com/llvm/llvm-project/tree/users/vgvassilev/D41416_D153003
> > 
> > 
> > If I drop it then our tests will break. IIUC that's somewhere deep in the hasher and should be not impact this PR. Does this make the work on the on-disk hashtable more complicated in some way?
> 
> No, it won't block the work for on-disk hashtable. But if we want to land that, we must understand what happened actually...

We can’t land that without attaching your on-disk hashtable implementation part of this PR because of what’s mentioned here https://github.com/llvm/llvm-project/pull/76774#issuecomment-1893222165

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