[llvm] [TTI] Don't drop VP intrinsic args when delegating to non-vp equivalent (PR #147677)

[Ramkumar Ramachandra via llvm-commits]

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artagnon wrote:

I have a very basic question: why does the arg-based cost differ from the type-based cost for vp.is.fpclass? What information is present in the arguments over and above their types?

https://github.com/llvm/llvm-project/pull/147677