[clang] [clang] Fix ASTWriter crash after merging named enums (PR #114240)

[Michael Jabbour via cfe-commits]

michael-jabbour-sonarsource wrote:

Gentle ping :smile:

@vsapsai, @vgvassilev, I think I have responded to your inquiries and added a few related questions. Could you have a look?

https://github.com/llvm/llvm-project/pull/114240