[libc-commits] [libc] [libc][math][c23] Add f16{add, sub}f C23 math functions (PR #96787)

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overmighty wrote:

Rebased to resolve the merge conflict and added this commit:

- **fixup! [libc][math][c23] Add f16subf C23 math function**  
  
  Replace ^ on bools with !=.


https://github.com/llvm/llvm-project/pull/96787