[turbofan] Lower monomorphic loads during graph building.

src/compiler/js-inlining.h

 // 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.
 
 #ifndef V8_COMPILER_JS_INLINING_H_
 #define V8_COMPILER_JS_INLINING_H_
 
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-graph.h"
 
@@ skipping 26 matching lines @@
   // Can be used by inlining heuristics or by testing code directly, without
   // using the above generic reducer interface of the inlining machinery.
   Reduction ReduceJSCall(Node* node);
 
  private:
   CommonOperatorBuilder* common() const;
   JSOperatorBuilder* javascript() const;
   SimplifiedOperatorBuilder* simplified() const;
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
+  Handle<Context> native_context() const;
 
   Zone* const local_zone_;
   CompilationInfo* info_;
   JSGraph* const jsgraph_;
   SourcePositionTable* const source_positions_;
 
   bool DetermineCallTarget(Node* node,
                            Handle<SharedFunctionInfo>& shared_info_out);
   void DetermineCallContext(Node* node, Node*& context_out,
                             Handle<FeedbackVector>& feedback_vector_out);
 
   Node* CreateArtificialFrameState(Node* node, Node* outer_frame_state,
                                    int parameter_count, BailoutId bailout_id,
                                    FrameStateType frame_state_type,
                                    Handle<SharedFunctionInfo> shared);
 
   Node* CreateTailCallerFrameState(Node* node, Node* outer_frame_state);
 
   Reduction InlineCall(Node* call, Node* new_target, Node* context,
                        Node* frame_state, Node* start, Node* end,
                        Node* exception_target,
                        const NodeVector& uncaught_subcalls);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_INLINING_H_