[llvm] DAG: Use sincos vector libcalls through RuntimeLibcalls (PR #166984)

[via llvm-commits]

Andarwinux wrote:

This PR seems have broken the ability to vectorize sincos with -fveclib, now it no longer vectorizes no matter which veclib is used.

see https://github.com/llvm/llvm-project/issues/167871

https://github.com/llvm/llvm-project/pull/166984