[turbofan] JSTypedLowering can just look at the type hints.

src/compiler/pipeline.cc

 // Copyright 2014 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/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/base/adapters.h"
@@ skipping 869 matching lines @@
     JSCreateLowering create_lowering(
         &graph_reducer, data->info()->dependencies(), data->jsgraph(),
         literals_array, temp_zone);
     JSTypedLowering::Flags typed_lowering_flags = JSTypedLowering::kNoFlags;
     if (data->info()->is_deoptimization_enabled()) {
       typed_lowering_flags |= JSTypedLowering::kDeoptimizationEnabled;
     }
     if (data->info()->is_optimizing_from_bytecode()) {
       typed_lowering_flags |= JSTypedLowering::kDisableIntegerBinaryOpReduction;
     }
-    if (data->info()->is_type_feedback_enabled()) {
-      typed_lowering_flags |= JSTypedLowering::kTypeFeedbackEnabled;
-    }
     JSTypedLowering typed_lowering(&graph_reducer, data->info()->dependencies(),
                                    typed_lowering_flags, data->jsgraph(),
                                    temp_zone);
     JSIntrinsicLowering intrinsic_lowering(
         &graph_reducer, data->jsgraph(),
         data->info()->is_deoptimization_enabled()
             ? JSIntrinsicLowering::kDeoptimizationEnabled
             : JSIntrinsicLowering::kDeoptimizationDisabled);
     ValueNumberingReducer value_numbering(temp_zone, data->graph()->zone());
     SimplifiedOperatorReducer simple_reducer(&graph_reducer, data->jsgraph());
@@ skipping 928 matching lines @@
   data->DeleteRegisterAllocationZone();
 }
 
 CompilationInfo* PipelineImpl::info() const { return data_->info(); }
 
 Isolate* PipelineImpl::isolate() const { return info()->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8