[turbofan] Remove the JSContextRelaxation reducer.

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 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/bytecode-graph-builder.h"
 
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/operator-properties.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 430 matching lines @@
                                            JSGraph* jsgraph)
     : local_zone_(local_zone),
       jsgraph_(jsgraph),
       bytecode_array_(handle(info->shared_info()->bytecode_array())),
       exception_handler_table_(
           handle(HandlerTable::cast(bytecode_array()->handler_table()))),
       feedback_vector_(info->feedback_vector()),
       frame_state_function_info_(common()->CreateFrameStateFunctionInfo(
           FrameStateType::kInterpretedFunction,
           bytecode_array()->parameter_count(),
-          bytecode_array()->register_count(), info->shared_info(),
-          CALL_MAINTAINS_NATIVE_CONTEXT)),
+          bytecode_array()->register_count(), info->shared_info())),
       deoptimization_enabled_(info->is_deoptimization_enabled()),
       merge_environments_(local_zone),
       exception_handlers_(local_zone),
       current_exception_handler_(0),
       input_buffer_size_(0),
       input_buffer_(nullptr),
       exit_controls_(local_zone) {}
 
 Node* BytecodeGraphBuilder::GetNewTarget() {
   if (!new_target_.is_set()) {
@@ skipping 1289 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8