Use length() instead of endOffset in YARPTranslator

Author: eregon

src/main/java/org/truffleruby/yarp/YARPTranslator.java

@@ -58,7 +58,7 @@ public RubyNode visitProgramNode(Nodes.ProgramNode node) {
 
     @Override
     public RubyNode visitStatementsNode(Nodes.StatementsNode node) {
-        var location = new SourceIndexLength(node.startOffset, node.endOffset - node.startOffset);
+        var location = new SourceIndexLength(node.startOffset, node.length());
 
         var body = node.body;
         var translated = new RubyNode[body.length];
@@ -86,8 +86,7 @@ public RubyNode visitCallNode(Nodes.CallNode node) {
 
     @Override
     public RubyNode visitIntegerNode(Nodes.IntegerNode node) {
-        String string = new String(source, node.startOffset, node.endOffset - node.startOffset,
-                StandardCharsets.US_ASCII);
+        String string = new String(source, node.startOffset, node.length(), StandardCharsets.US_ASCII);
         int value = Integer.parseInt(string);
         return new IntegerFixnumLiteralNode(value);
     }