[libc-commits] [libc] [libc][math][c23] Add f16sqrt{, l, f128} C23 math functions (PR #96642)

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overmighty wrote:

Rebased to fix a merge conflict and added these 2 commits:
- [libc][math][c23] Move f16sqrt{,f,l} specs to llvm_libc_ext.td
- [libc][math][c23] Disable f16sqrt{l,f128} on AArch64 Linux


https://github.com/llvm/llvm-project/pull/96642