[clang] [WIP] [Modules] Delay reading type source info of the preferred_name attribute. (PR #122250)

[Viktoriia Bakalova via cfe-commits]

VitaNuo wrote:

I have pushed an alternative approach (reading the attribute at record level) to https://github.com/llvm/llvm-project/pull/122726.
If we agree that this approach is the one to go in general, I can try to generalize it to multiple attributes.

https://github.com/llvm/llvm-project/pull/122250