[libc-commits] [libc] [libc][math][c23] Add exp2f16 C23 math function (PR #101217)

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overmighty wrote:

I didn't enable `exp2f16` for AArch64 yet due to the issue with `FE_INVALID` we just had there with `expf16`.

https://github.com/llvm/llvm-project/pull/101217