Proposal to add FDO profile quality related diagnostics

[Andi Kleen]

> 
>  Regarding the function level detail being too noisy : I sort of agree with that
>  comment. But I am of the opinion that I would rather leave it to the user to
>  infer the profile quality as per the application characteristics.

Makes sense I guess. But I would keep the drill down as opt-info.
opt-info is better designed for really high volume data like this.

-Andi