type pcinlineState struct {
	globalToLocal map[int]int
	localTree     InlTree
}

// addBranch adds a branch from the global inlining tree in ctxt to
// the function's local inlining tree, returning the index in the local tree.
func (s *pcinlineState) addBranch(ctxt *Link, globalIndex int) int {
	if globalIndex < 0 {
		return -1
	}

	localIndex, ok := s.globalToLocal[globalIndex]
	if ok {
		return localIndex