[turbofan] Allow indexed access to node inputs/input_edges

src/compiler/node.cc

Index: src/compiler/node.cc
diff --git a/src/compiler/node.cc b/src/compiler/node.cc
index f4e7b17ed235fda2c6d0e7b6ac19e950c98e7d26..1410ab436cef5c2ebac7786155b40e85ee0aef4f 100644
--- a/src/compiler/node.cc
+++ b/src/compiler/node.cc
@@ -404,9 +404,6 @@ Node::InputEdges::iterator Node::InputEdges::iterator::operator++(int n) {
 }
 
 
-bool Node::InputEdges::empty() const { return begin() == end(); }
-
-
 Node::Inputs::const_iterator Node::Inputs::const_iterator::operator++(int n) {
   const_iterator result(*this);
   ++(*this);
@@ -414,9 +411,6 @@ Node::Inputs::const_iterator Node::Inputs::const_iterator::operator++(int n) {
 }
 
 
-bool Node::Inputs::empty() const { return begin() == end(); }
-
-
 Node::UseEdges::iterator Node::UseEdges::iterator::operator++(int n) {
   iterator result(*this);
   ++(*this);