Remove deprecated constant helpers from JSGenericLowering.

src/compiler/js-generic-lowering.h

Index: src/compiler/js-generic-lowering.h
diff --git a/src/compiler/js-generic-lowering.h b/src/compiler/js-generic-lowering.h
index 63d8e93ca45853174991a3a339e6c6e6a806eb2b..e4b20d0840f86a2a900b1eb51481bc3b4dfd7dab 100644
--- a/src/compiler/js-generic-lowering.h
+++ b/src/compiler/js-generic-lowering.h
@@ -36,13 +36,6 @@ class JSGenericLowering : public Reducer {
   ALL_OP_LIST(DECLARE_LOWER)
 #undef DECLARE_LOWER
 
-  // Helpers to create new constant nodes.
-  Node* SmiConstant(int immediate);
-  Node* Int32Constant(int immediate);
-  Node* CodeConstant(Handle<Code> code);
-  Node* FunctionConstant(Handle<JSFunction> function);
-  Node* ExternalConstant(ExternalReference ref);
-
   // Helpers to patch existing nodes in the graph.
   void PatchOperator(Node* node, const Operator* new_op);
   void PatchInsertInput(Node* node, int index, Node* input);
@@ -53,6 +46,9 @@ class JSGenericLowering : public Reducer {
   void ReplaceWithBuiltinCall(Node* node, Builtins::JavaScript id, int args);
   void ReplaceWithRuntimeCall(Node* node, Runtime::FunctionId f, int args = -1);
 
+  // Helper for optimization of JSCallFunction.
+  bool TryLowerDirectJSCall(Node* node);
+
   Zone* zone() const { return graph()->zone(); }
   Isolate* isolate() const { return zone()->isolate(); }
   JSGraph* jsgraph() const { return jsgraph_; }
@@ -66,8 +62,6 @@ class JSGenericLowering : public Reducer {
   CompilationInfo* info_;
   JSGraph* jsgraph_;
   Linkage* linkage_;
-
-  bool TryLowerDirectJSCall(Node* node);
 };
 
 }  // namespace compiler