runtime/debug: reimplement Stack and PrintStack using runtime.Stack?

[rsc]

We marked debug.Stack (and implicitly debug.PrintStack) as explicitly deprecated, telling people to use runtime.Stack instead. But runtime.Stack is not as convenient. Perhaps we should make debug.Stack a trivial (but more convenient) wrapper around runtime.Stack and undeprecate it.

[rsc]

Or else we at least need to mark debug.Printstack explicitly deprecated.

[gopherbot]

CL https://golang.org/cl/14604 mentions this issue.