[turbofan] Allow indexed access to node inputs/input_edges

src/compiler/node.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/node.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 386 matching lines @@
 }
 
 
 Node::InputEdges::iterator Node::InputEdges::iterator::operator++(int n) {
   iterator result(*this);
   ++(*this);
   return result;
 }
 
 
-bool Node::InputEdges::empty() const { return begin() == end(); }
-
-
 Node::Inputs::const_iterator Node::Inputs::const_iterator::operator++(int n) {
   const_iterator result(*this);
   ++(*this);
   return result;
 }
 
 
-bool Node::Inputs::empty() const { return begin() == end(); }
-
-
 Node::UseEdges::iterator Node::UseEdges::iterator::operator++(int n) {
   iterator result(*this);
   ++(*this);
   return result;
 }
 
 
 bool Node::UseEdges::empty() const { return begin() == end(); }
 
 
 Node::Uses::const_iterator Node::Uses::const_iterator::operator++(int n) {
   const_iterator result(*this);
   ++(*this);
   return result;
 }
 
 
 bool Node::Uses::empty() const { return begin() == end(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8