adding --output-format=json to gprof

[Eric Christopher]

>
> Is this the kind of change that (if done "correctly") you'd be  
> willing to accept into the main line gprof sources?  If not, what  
> might you be willing to accept?

I think this is a reasonable suggestion. Having the gprof output in  
as many easily read formats as possible (as long as it doesn't affect  
maintainability) would be a good thing.

-eric