[Misc] Use `LLVM_ENABLE_ABI_BREAKING_CHECKS` correctly (#94212)
`LLVM_ENABLE_ABI_BREAKING_CHECKS` is always defined: https://github.com/llvm/llvm-project/blob/72c901f5e59477e568b1b04dae9de753b9d1f6f3/llvm/include/llvm/Config/abi-breaking.h.cmake#L16C2-L16C15 It uses `cmakedefine01` rather than `cmakedefine`, so `LLVM_ENABLE_ABI_BREAKING_CHECKS` is always defined, so the preprocessed code is probably not what the author wanted.
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