[libc-commits] [libc] [libc][math][c23] Implement C23 math function asinpif16 (PR #146226)

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overmighty wrote:

Looks like `mpfr_asinpi` is only available in MPFR 4.2.0 and later. I'll revert until we have a workaround.

https://github.com/llvm/llvm-project/pull/146226