[llvm] [CGData] Global Merge Functions (PR #112671)

[Kyungwoo Lee via llvm-commits]

kyulee-com wrote:

> 
> Weird if you can't reproduce it. I did again at [878b03e](https://github.com/llvm/llvm-project/commit/878b03e0b96698ced5fb6a70dc80df05ef884f8c). Asserts must be on. Anyway I tried #116241 and with that it doesn't crash for me.

Yeah. I forgot enabling asserts. Now I can see an assertion. I think #116241 should land it for this fix. Can you review it?

https://github.com/llvm/llvm-project/pull/112671