[mlir] Change ABI breaking use of NDEBUG to LLVM_ENABLE_ABI_BREAKING_CHECKS in DebugActions.h

A quick grep for NDEBUG in MLIR revealed a use in DebugActions.h that breaks ABI. This patch changes the use of NDEBUG to LLVM_ENABLE_ABI_BREAKING_CHECKS which has the advantage of being independent of whether clients build their own app in debug or release as it is purely dependant on how MLIR itself was built.

Differential Revision: https://reviews.llvm.org/D113088