Add information about cargo-pgo to the Profile-Guided Optimization documentation

[zamazan4ik]

Location

https://doc.rust-lang.org/rustc/profile-guided-optimization.html

Summary

I think would be nice to mention cargo-pgo in the Rustc Profile-Guided Optimization documentation. With cargo-pgo it's much easier to apply PGO to the Rust programs (I did it many times). I suggest adding the information about cargo-pgo to the mentioned above page. Even if this project does not belong directly to Rustc or Cargo - it's still worth mentioning.

@Kobzol - ping you as the cargo-pgo author.

P.S. I am creating the issue here since not sure where it should go. Maybe we want to mention cargo-pgo in the Cargo book as well.

[meysam81]

I don't know if this is already approved, but in case it is, here's my effort for a chance of contribution.

[meysam81]

@rustbot claim

[Kobzol]

Well, I would of course like it to be mentioned in the docs :) I'm not sure what's the policy on linking to community maintained Cargo subcommands though (if there is any).