Reland "Add initial support for inlining."

src/compiler/generic-node.h

 // 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.
 
 #ifndef V8_COMPILER_GENERIC_NODE_H_
 #define V8_COMPILER_GENERIC_NODE_H_
 
 #include <deque>
 
 #include "src/v8.h"
@@ skipping 186 matching lines @@
   bool operator==(const iterator& other) const {
     return other.index_ == index_ && other.node_ == node_;
   }
   bool operator!=(const iterator& other) const { return !(other == *this); }
   iterator& operator++() {
     DCHECK(node_ != NULL);
     DCHECK(index_ < node_->input_count_);
     ++index_;
     return *this;
   }
+  iterator& UpdateToAndIncrement(GenericNode<B, S>* new_to) {
+    typename GenericNode<B, S>::Input* input = GetInput();
+    input->Update(new_to);
+    index_++;
+    return *this;
+  }
   int index() { return index_; }
 
  private:
   friend class GenericNode;
 
   explicit iterator(GenericNode* node, int index)
       : node_(node), index_(index) {}
 
   Input* GetInput() const { return node_->GetInputRecordPtr(index_); }
 
@@ skipping 45 matching lines @@
   }
 
   typename GenericNode<B, S>::Use* current_;
   int index_;
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_GENERIC_NODE_H_