[clang] [Serialization] Fix crash while lazy-loading template specializations (PR #150430)

[Michael Jabbour via cfe-commits]

michael-jabbour-sonarsource wrote:

I am a bit confused where this comes from. The correct email address is also shown on the commit: https://api.github.com/repos/llvm/llvm-project/commits/c3cf089fb721a52993c42d0fe18547685d8badb6

https://github.com/llvm/llvm-project/pull/150430