// structure, not the stack. Check if this is the case and if so,
	// remove.

	// Remove up to two frames.
	maxiter := 2
	// Allow one different sample for this many samples with the same
	// second-to-last frame.
	similarSamples := 32
	margin := len(p.Sample) / similarSamples

	for iter := 0; iter < maxiter; iter++ {
		addr1 := make(map[uint64]int)
		for _, s := range p.Sample {
			if len(s.Location) > 1 {

	"plugin": {
		{"(*Plugin).Lookup", Method, 8},
		{"Open", Func, 8},
		{"Plugin", Type, 8},
		{"Symbol", Type, 8},
	},
	"reflect": {
		{"(*MapIter).Key", Method, 12},
		{"(*MapIter).Next", Method, 12},
		{"(*MapIter).Reset", Method, 18},
		{"(*MapIter).Value", Method, 12},
		{"(*ValueError).Error", Method, 0},
		{"(ChanDir).String", Method, 0},
		{"(Kind).String", Method, 0},

//   - removing an element (only by the caller who added it)
//   - taking (get + delete) a random element
//
// We previously used a map for this but the take of a random element
// was expensive, making mapiters. This type avoids a map entirely
// and just uses a slice.
type connRequestSet struct {
	// s are the elements in the set.
	s []connRequestAndIndex
}

type connRequestAndIndex struct {