[turbofan] Redundant branch elimination.

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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 # Because standalone V8 builds are not supported, assume this is part of a
@@ skipping 674 matching lines @@
     "src/compiler/access-builder.cc",
     "src/compiler/access-builder.h",
     "src/compiler/all-nodes.cc",
     "src/compiler/all-nodes.h",
     "src/compiler/ast-graph-builder.cc",
     "src/compiler/ast-graph-builder.h",
     "src/compiler/ast-loop-assignment-analyzer.cc",
     "src/compiler/ast-loop-assignment-analyzer.h",
     "src/compiler/basic-block-instrumentor.cc",
     "src/compiler/basic-block-instrumentor.h",
+    "src/compiler/branch-condition-elimination.cc",
+    "src/compiler/branch-condition-elimination.h",
     "src/compiler/bytecode-graph-builder.cc",
     "src/compiler/bytecode-graph-builder.h",
     "src/compiler/change-lowering.cc",
     "src/compiler/change-lowering.h",
     "src/compiler/c-linkage.cc",
     "src/compiler/coalesced-live-ranges.cc",
     "src/compiler/coalesced-live-ranges.h",
     "src/compiler/code-generator-impl.h",
     "src/compiler/code-generator.cc",
     "src/compiler/code-generator.h",
@@ skipping 1114 matching lines @@
     if (!is_component_build) {
       sources += [
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }