[clang] [clang][Modules] Keep existing global definition on type mismatch in GetOrCreateLLVMGlobal (PR #223877)

[Yuxuan Chen via cfe-commits]

yuxuanchen1997 wrote:

> This looks like a workaround to the real issue. Why can't the global be merged properly?

Can you clarify what "merge properly" means here? These globals are differing LLVM types instead of `QualType`s. I am not sure how to merge them.

https://github.com/llvm/llvm-project/pull/223877