[Mlir-commits] [llvm] [mlir] Fix LLVM_ENABLE_ABI_BREAKING_CHECKS macro check: use #if instead of #ifdef (PR #110185)

[Scott Todd]

ScottTodd wrote:

For reference: https://llvm.org/docs/CMake.html#llvm-related-variables

> **LLVM_ABI_BREAKING_CHECKS**:STRING
  Used to decide if LLVM should be built with ABI breaking checks or
  not.  Allowed values are `WITH_ASSERTS` (default), `FORCE_ON` and
  `FORCE_OFF`.  `WITH_ASSERTS` turns on ABI breaking checks in an
  assertion enabled build.  `FORCE_ON` (`FORCE_OFF`) turns them on
  (off) irrespective of whether normal (`NDEBUG`-based) assertions are
  enabled or not.  A version of LLVM built with ABI breaking checks
  is not ABI compatible with a version built without it.

https://github.com/llvm/llvm-project/pull/110185