[clang] Revert "[Serialization] Stop demote var definition as declaration (#172430)" (PR #181384)

[Aiden Grossman via cfe-commits]

boomanaiden154 wrote:

> We should submit the revert. We already have a reproducer showing the issue.

If someone wants to approve, I'm happy to submit.

https://github.com/llvm/llvm-project/pull/181384