func ConvertedFrom(v Value, typ string) bool {
	change, ok := v.Value.(*ssa.ChangeType)
	return ok && IsType(change.X.Type(), typ)
}
func ConvertedFrom(v Value, typ string) bool {
	change, ok := v.Value.(*ssa.ChangeType)
	return ok && IsType(change.X.Type(), typ)
}
// ConvertedFrom reports whether value v was converted from type typ.