[llvm] [CodeGen] Parse frame-pointer attribute once when creating MachineFunction (PR #191974)

[Alexis Engelke via llvm-commits]

aengelke wrote:

> it does show up a couple more times in the profile I'm looking at but DisableFramePointerElim is why i believe

hasFPImpl should return the same thing for every function, so even if DisableFramePointerElim is fast, it'd still be wasteful to repeatedly check a dozen properties what should just be a single property.

Not saying we shouldn't do this -- just saying that there's more potential in addition to this.

https://github.com/llvm/llvm-project/pull/191974