[llvm] [mlir] Revert "Fix LLVM_ENABLE_ABI_BREAKING_CHECKS macro check: use #if inst… (PR #110923)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

Actually it may be the opposite config (which is why I didn't have the issue locally): it may be a debug build with the LLVM_ENABLE_ABI_BREAKING_CHECKS disabled, I'll test this.

https://github.com/llvm/llvm-project/pull/110923