[llvm] [NFC][TargetTransformInfo][VectorUtils] Consolidate `isVectorIntrinsic...` api (PR #117635)

[Finn Plummer via llvm-commits]

inbelic wrote:

Sure, I think it makes sense to move the `ScalarizerVisitor::isTriviallyScalarizable` to `VectorUtils.cpp`.

By consolidate, do you mean to just have one of `isTriviallyVectorizable` and `isTriviallyScalarizable`?

https://github.com/llvm/llvm-project/pull/117635