Deprecte LoweringBuilder in favor of Reducer.

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 487 matching lines @@
     "src/compiler/js-generic-lowering.cc",
     "src/compiler/js-generic-lowering.h",
     "src/compiler/js-graph.cc",
     "src/compiler/js-graph.h",
     "src/compiler/js-operator.h",
     "src/compiler/js-typed-lowering.cc",
     "src/compiler/js-typed-lowering.h",
     "src/compiler/linkage-impl.h",
     "src/compiler/linkage.cc",
     "src/compiler/linkage.h",
-    "src/compiler/lowering-builder.cc",
-    "src/compiler/lowering-builder.h",
     "src/compiler/machine-node-factory.h",
     "src/compiler/machine-operator-reducer.cc",
     "src/compiler/machine-operator-reducer.h",
     "src/compiler/machine-operator.h",
     "src/compiler/node-aux-data-inl.h",
     "src/compiler/node-aux-data.h",
     "src/compiler/node-cache.cc",
     "src/compiler/node-cache.h",
     "src/compiler/node-matchers.h",
     "src/compiler/node-properties-inl.h",
@@ skipping 752 matching lines @@
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }