[clang] [WIP][Modules] Delay deserialization of preferred_name attribute at r… (PR #122726)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

Can you add more details to the patch summary explaining why the changes are needed? That makes it easier for folks to review the patch but also helps us in the future when digging through historical changes. Thanks!

https://github.com/llvm/llvm-project/pull/122726