[turbofan] Remove obsolete JSTypeFeedbackSpecializer and JSTypeFeedbackLowering.

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 759 matching lines @@
     "src/compiler/js-inlining.cc",
     "src/compiler/js-inlining.h",
     "src/compiler/js-inlining-heuristic.cc",
     "src/compiler/js-inlining-heuristic.h",
     "src/compiler/js-intrinsic-lowering.cc",
     "src/compiler/js-intrinsic-lowering.h",
     "src/compiler/js-native-context-specialization.cc",
     "src/compiler/js-native-context-specialization.h",
     "src/compiler/js-operator.cc",
     "src/compiler/js-operator.h",
-    "src/compiler/js-type-feedback.cc",
-    "src/compiler/js-type-feedback.h",
-    "src/compiler/js-type-feedback-lowering.cc",
-    "src/compiler/js-type-feedback-lowering.h",
     "src/compiler/js-typed-lowering.cc",
     "src/compiler/js-typed-lowering.h",
     "src/compiler/jump-threading.cc",
     "src/compiler/jump-threading.h",
     "src/compiler/linkage.cc",
     "src/compiler/linkage.h",
     "src/compiler/live-range-separator.cc",
     "src/compiler/live-range-separator.h",
     "src/compiler/liveness-analyzer.cc",
     "src/compiler/liveness-analyzer.h",
@@ skipping 1045 matching lines @@
     if (!is_component_build) {
       sources += [
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }