`SelectionDAGISel.cpp` is broken when `NDEBUG` is defined and `LLVM_ENABLE_ABI_BREAKING_CHECKS` is 1

[andportnoy]

#94149 (comment)

[andportnoy]

This got surfaced by bf25ecb.

[joker-eph]

I don't quite see why one would want a release config with LLVM_ENABLE_ABI_BREAKING_CHECKS enabled?

[andportnoy]

cc @steelannelida