Revert of Reland: Remove register index/code indirection

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 801 matching lines @@
     "src/compiler/pipeline.cc",
     "src/compiler/pipeline.h",
     "src/compiler/pipeline-statistics.cc",
     "src/compiler/pipeline-statistics.h",
     "src/compiler/raw-machine-assembler.cc",
     "src/compiler/raw-machine-assembler.h",
     "src/compiler/register-allocator.cc",
     "src/compiler/register-allocator.h",
     "src/compiler/register-allocator-verifier.cc",
     "src/compiler/register-allocator-verifier.h",
+    "src/compiler/register-configuration.cc",
+    "src/compiler/register-configuration.h",
     "src/compiler/representation-change.h",
     "src/compiler/schedule.cc",
     "src/compiler/schedule.h",
     "src/compiler/scheduler.cc",
     "src/compiler/scheduler.h",
     "src/compiler/select-lowering.cc",
     "src/compiler/select-lowering.h",
     "src/compiler/simplified-lowering.cc",
     "src/compiler/simplified-lowering.h",
     "src/compiler/simplified-operator-reducer.cc",
@@ skipping 309 matching lines @@
     "src/regexp/jsregexp.h",
     "src/regexp/regexp-macro-assembler-irregexp-inl.h",
     "src/regexp/regexp-macro-assembler-irregexp.cc",
     "src/regexp/regexp-macro-assembler-irregexp.h",
     "src/regexp/regexp-macro-assembler-tracer.cc",
     "src/regexp/regexp-macro-assembler-tracer.h",
     "src/regexp/regexp-macro-assembler.cc",
     "src/regexp/regexp-macro-assembler.h",
     "src/regexp/regexp-stack.cc",
     "src/regexp/regexp-stack.h",
-    "src/register-configuration.cc",
-    "src/register-configuration.h",
     "src/runtime-profiler.cc",
     "src/runtime-profiler.h",
     "src/runtime/runtime-array.cc",
     "src/runtime/runtime-atomics.cc",
     "src/runtime/runtime-classes.cc",
     "src/runtime/runtime-collections.cc",
     "src/runtime/runtime-compiler.cc",
     "src/runtime/runtime-date.cc",
     "src/runtime/runtime-debug.cc",
     "src/runtime/runtime-forin.cc",
@@ skipping 656 matching lines @@
     if (!is_component_build) {
       sources += [
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }