[turbofan]: Add a context relaxer reducer

src/compiler/frame-states.h

 // 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.
 
 #ifndef V8_COMPILER_FRAME_STATES_H_
 #define V8_COMPILER_FRAME_STATES_H_
 
 #include "src/handles-inl.h"
 
 namespace v8 {
@@ skipping 58 matching lines @@
 };
 
 
 // The type of stack frame that a FrameState node represents.
 enum class FrameStateType {
   kJavaScriptFunction,  // Represents an unoptimized JavaScriptFrame.
   kArgumentsAdaptor     // Represents an ArgumentsAdaptorFrame.
 };
 
 
+enum ContextCallingMode {
+  CALL_MAINTAINS_NATIVE_CONTEXT,
+  CALL_CHANGES_NATIVE_CONTEXT
+};
+
+
 class FrameStateFunctionInfo {
  public:
   FrameStateFunctionInfo(FrameStateType type, int parameter_count,
                          int local_count,
-                         Handle<SharedFunctionInfo> shared_info)
+                         Handle<SharedFunctionInfo> shared_info,
+                         ContextCallingMode context_calling_mode)
       : type_(type),
         parameter_count_(parameter_count),
         local_count_(local_count),
-        shared_info_(shared_info) {}
+        shared_info_(shared_info),
+        context_calling_mode_(context_calling_mode) {}
 
   int local_count() const { return local_count_; }
   int parameter_count() const { return parameter_count_; }
   Handle<SharedFunctionInfo> shared_info() const { return shared_info_; }
   FrameStateType type() const { return type_; }
+  ContextCallingMode context_calling_mode() const {
+    return context_calling_mode_;
+  }
 
  private:
   FrameStateType const type_;
   int const parameter_count_;
   int const local_count_;
   Handle<SharedFunctionInfo> const shared_info_;
+  ContextCallingMode context_calling_mode_;
 };
 
 
 class FrameStateInfo final {
  public:
   FrameStateInfo(BailoutId bailout_id, OutputFrameStateCombine state_combine,
                  const FrameStateFunctionInfo* info)
       : bailout_id_(bailout_id),
         frame_state_combine_(state_combine),
         info_(info) {}
@@ skipping 35 matching lines @@
 static const int kFrameStateContextInput = 3;
 static const int kFrameStateFunctionInput = 4;
 static const int kFrameStateOuterStateInput = 5;
 static const int kFrameStateInputCount = kFrameStateOuterStateInput + 1;
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_FRAME_STATES_H_