[llvm] [TLI][AArch64] Add extra SLEEF mappings and tests (PR #78140)

[Alexandros Lamprineas via llvm-commits]

labrinea wrote:

Do we not want tests in ```llvm/test/Transforms/Util/add-TLI-mappings.ll``` ?

https://github.com/llvm/llvm-project/pull/78140