[refactoring] update ast structure of "Throw" node

pkg/ast/node.go

@@ -709,7 +709,9 @@ func (n *StmtSwitch) Accept(v NodeVisitor) {
 // StmtThrow node
 type StmtThrow struct {
 	Node
-	Expr Vertex
+	ThrowTkn     *token.Token
+	Expr         Vertex
+	SemiColonTkn *token.Token
 }
 
 func (n *StmtThrow) Accept(v NodeVisitor) {

pkg/ast/visitor/filter_tokens.go

@@ -260,3 +260,8 @@ func (v *FilterTokens) StmtFinally(n *ast.StmtFinally) {
 	n.OpenCurlyBracketTkn = nil
 	n.CloseCurlyBracketTkn = nil
 }
+
+func (v *FilterTokens) StmtThrow(n *ast.StmtThrow) {
+	n.ThrowTkn = nil
+	n.SemiColonTkn = nil
+}