[clang] [llvm] [TLI][Darwin] Add mappings for 16 more libsystem_m vector functions (PR #224792)

[Luke Kiernan via cfe-commits]

luke-kiernan wrote:

`git diff --stat` shows 221 deletions in `veclib-calls-libsystem-darwin.ll`, but that's just git realigning near-identical test blocks.

On the AI usage policy: I wrote a couple by hand then let Claude code do the rest, since it's basically "copy-paste adjacent code then edit the stem." I have verified that the changes have the intended effect--the loops now vectorize.

https://github.com/llvm/llvm-project/pull/224792