[clang] [Serialization] Fix lazy template loading (PR #133057)

[Alexander Kornienko via cfe-commits]

alexfh wrote:

> @alexfh sorry for the additional ping, I know that the end of the year is usually vacation time. However, given that `release/22.x` will branch next week, I wondered if you managed to test and we could still target to finally get these fixes in?

Sorry for the delayed response. I was indeed on vacation, but now I'm back to work and I can test the PR. 

https://github.com/llvm/llvm-project/pull/133057