[llvm] [RISC-V] Pool duplicate scheduling class descriptors (PR #202659)

[Alexis Engelke via llvm-commits]

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aengelke wrote:

I think the use of NDEBUG is actually problematic here, this is ABI-breaking; we definitely shouldn't spread NDEBUG defines in headers.

https://github.com/llvm/llvm-project/pull/202659