[llvm] [Analysis] atan2: isTriviallyVectorizable; add to massv and accelerate veclibs (PR #113637)

[Farzon Lotfi via llvm-commits]

farzonl wrote:

See this pr: https://github.com/llvm/llvm-project/pull/95517/files

tests like this should show that the libcall  name to intrinsic mapping in the check line

llvm/test/Transforms/SLPVectorizer/X86/call.ll



https://github.com/llvm/llvm-project/pull/113637