[llvm] [WebAssembly] [Codegen] Add pattern for relaxed min max from fminimum/fmaximum over v4f32 and v2f64 (PR #162948)

[Sam Parker via llvm-commits]

https://github.com/sparker-arm commented:

I just compiled some simple C to perform the operations with the select operator and min/max will get lowered to a `select` with `fcmp olt/ogt`. There are already some patterns, somewhere in this file, which use pmin/max for those. Would you mind adding similar patterns for these relaxed instructions?

https://github.com/llvm/llvm-project/pull/162948