Deprecte LoweringBuilder in favor of Reducer.

src/compiler/lowering-builder.cc

-// Copyright 2014 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/graph-inl.h"
-#include "src/compiler/lowering-builder.h"
-#include "src/compiler/node-aux-data-inl.h"
-#include "src/compiler/node-properties-inl.h"
-
-namespace v8 {
-namespace internal {
-namespace compiler {
-
-class LoweringBuilder::NodeVisitor : public NullNodeVisitor {
- public:
-  explicit NodeVisitor(LoweringBuilder* lowering) : lowering_(lowering) {}
-
-  GenericGraphVisit::Control Post(Node* node) {
-    if (lowering_->source_positions_ != NULL) {
-      SourcePositionTable::Scope pos(lowering_->source_positions_, node);
-      lowering_->Lower(node);
-    } else {
-      lowering_->Lower(node);
-    }
-    return GenericGraphVisit::CONTINUE;
-  }
-
- private:
-  LoweringBuilder* lowering_;
-};
-
-
-LoweringBuilder::LoweringBuilder(Graph* graph,
-                                 SourcePositionTable* source_positions)
-    : graph_(graph), source_positions_(source_positions) {}
-
-
-void LoweringBuilder::LowerAllNodes() {
-  NodeVisitor visitor(this);
-  graph()->VisitNodeInputsFromEnd(&visitor);
-}
-
-}  // namespace compiler
-}  // namespace internal
-}  // namespace v8