cmd/pprof: upgrade "go tool pprof" to a version that can render flame graphs

[dweitzman]

The vendored version of pprof in golang is more than a year old.

Flame graph support has been added to pprof since them, so it seems worthwhile to update the dependency.

[ALTree]

Thanks for the report.

The vendored version of pprof in golang is more than a year old.

I assume you're talking about the version vendored in go1.10.

Current tip (to be 1.11) includes upstream revision 1ddc9e21ddc9e2, it was vendored recently (see https://go-review.googlesource.com/c/go/+/115295); so for flame graph support there's nothing else left to do except wait for the next go release (go1.11).

Closing here, since the work has already been done.