[libc-commits] [libc] [libc][math][c23] Add f16{add, sub}{, l, f128} C23 math functions (PR #97072)

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overmighty wrote:

Rebased to fix merge conflicts, re-merged overmighty:libc-math-f16addf, and added this commit:
- [libc][math][c23] Move f16{add,sub}{,l} specs to llvm_libc_ext.td

https://github.com/llvm/llvm-project/pull/97072