[llvm] Attributor: Add denormal-fp-math to attributor-light (PR #79576)

[Johannes Doerfert via llvm-commits]

https://github.com/jdoerfert commented:

It shouldn't "need" AAIsDead. And it's unlikely we want to add that right now. Let me check.
You basically want to ensure AA-light does the same for denormal-fp-math, right?

https://github.com/llvm/llvm-project/pull/79576