[llvm] [mlir] [mlir][x86vector] Simplify intrinsic generation (PR #133692)

[Adam Siemieniuk via llvm-commits]

adam-smnk wrote:

Rebased on main + further generalization of the conversion to intrinsic calls through an op interface - @banach-space thanks for all the suggestions 👍

https://github.com/llvm/llvm-project/pull/133692