[llvm] Optionally print `!prof` metadata inline (PR #130303)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

> Agree with @pcc, an option to generally print instruction metadata inline would be quite useful. (Excluding distinct and self-referential metadata.)

I agree it would be nice - let me look into the complications @teresajohnson was mentioning. I didn't realize that inlined metadata would be parsed, that's good to know!

https://github.com/llvm/llvm-project/pull/130303