[llvm] [AIX][ifunc] fix error message creation logic (misbehaves in production builds) (PR #188060)

[Zarko Todorovski via llvm-commits]

ZarkoT wrote:

What kind of LLVM builds does this happen in? 

Do we need a test to make sure the error is emitted correctly? For example, if someone changes it to what you had originally? 

https://github.com/llvm/llvm-project/pull/188060