[llvm] [FMV][GlobalOpt] Bypass the IFunc Resolver of MultiVersioned functions. (PR #87939)

[Alexandros Lamprineas via llvm-commits]

labrinea wrote:

@jroelofs, aside from semantics which I'll clarify with Andrew, I am thinking that the constant folding part might be redundant and whether `FeatureBitset` is an alternative to the TargetParser.

https://github.com/llvm/llvm-project/pull/87939