[libc-commits] [libc] [libc][math][c23] Add dadd{l, f128} and ddiv{l, f128} C23 math functions (PR #100456)

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overmighty wrote:

I've changed the PR title to better reflect the fact that it adds multiple variants of `dadd*` and `ddiv*`, if you don't mind.

Be careful of what you set the PR description to, as GitHub will suggest that as extended commit description by default when merging.

https://github.com/llvm/llvm-project/pull/100456