[llvm] [AArch64][TLI] Add TLI mappings for ArmPL modf, sincos, sincospi (PR #83143)

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

@mgabka agreed, thanks. Amended the commit message to now include this.

https://github.com/llvm/llvm-project/pull/83143