[turbofan]: Add a context relaxer reducer

src/compiler/frame-states.h

Index: src/compiler/frame-states.h
diff --git a/src/compiler/frame-states.h b/src/compiler/frame-states.h
index 42c41f910733ddc0bceacad40a6bdd2f88a9345b..328679ff74f76d0053bc975736778b2e17053a59 100644
--- a/src/compiler/frame-states.h
+++ b/src/compiler/frame-states.h
@@ -76,26 +76,38 @@ enum class FrameStateType {
 };
 
 
+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_;
 };