[libc-commits] [libc] [libc] Disable -NaN test on float128 systems (PR #70146)

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lntue wrote:

Thanks for taking care of this!  Probably we should add comments about aarch64's behavior in the test, and add a test to check only `NaN` containment in the `#else` clause in the followup.

https://github.com/llvm/llvm-project/pull/70146