implement runtime callers

[visualfc]

implement runtime func

runtime.Caller
runtime.FuncForPC
runtime.Callers
(*runtime.Frames).Next
(*runtime.Func).FileLine
(reflect.Value).Pointer
runtime.Stack 
runtime/debug.Stack
runtime/debug.PrintStack

*runtime.Stack(bug []uint8, all bool) always = runtime.Stack(buf, false)

ssa method wrapper

func$bound T(0).f -> runtime main.T.f-fm
func$thunk T.f -> runtime main.T.f
func$thunk (struct{ T }).f -> runtime go.struct { main.T }.main.f 1

type T int

func (T) f() int
func (*T) g()
var (
	// thunks
	a = T.f
	b = T.f
	c = (struct{ T }).f
	d = (struct{ T }).f
	e = (*T).g
	f = (*T).g
	g = (struct{ *T }).g
	h = (struct{ *T }).g

	// bounds
	i = T(0).f
	j = T(0).f
	k = new(T).g
	l = new(T).g
}