[turbofan] Remove obsolete JSTypeFeedbackSpecializer and JSTypeFeedbackLowering.

src/compiler.cc

 // Copyright 2012 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.h"
 
 #include <algorithm>
 
 #include "src/ast-numbering.h"
 #include "src/bootstrapper.h"
@@ skipping 425 matching lines @@
       os << "]" << std::endl;
     }
 
     if (info()->shared_info()->asm_function()) {
       if (info()->osr_frame()) info()->MarkAsFrameSpecializing();
       info()->MarkAsFunctionContextSpecializing();
     } else if (info()->has_global_object() &&
                FLAG_native_context_specialization) {
       info()->MarkAsNativeContextSpecializing();
       info()->MarkAsTypingEnabled();
-    } else if (FLAG_turbo_type_feedback) {
-      info()->MarkAsTypeFeedbackEnabled();
-      info()->EnsureFeedbackVector();
     }
     if (!info()->shared_info()->asm_function() ||
         FLAG_turbo_asm_deoptimization) {
       info()->MarkAsDeoptimizationEnabled();
     }
 
     Timer t(this, &time_taken_to_create_graph_);
     compiler::Pipeline pipeline(info());
     pipeline.GenerateCode();
     if (!info()->code().is_null()) {
@@ skipping 1332 matching lines @@
 }
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate()).PrintProgram(literal()));
 }
 #endif
 }  // namespace internal
 }  // namespace v8