Support polymorphic loads of constant functions as well as fields.

src/x64/lithium-codegen-x64.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 246 matching lines @@
   // Returns the condition on which a final split to
   // true and false label should be made, to optimize fallthrough.
   Condition EmitIsObject(Register input,
                          Label* is_not_object,
                          Label* is_object);
 
   // Emits optimized code for %_IsConstructCall().
   // Caller should branch on equal condition.
   void EmitIsConstructCall(Register temp);
 
-  void EmitLoadField(Register result,
-                     Register object,
-                     Handle<Map> type,
-                     Handle<String> name);
+  void EmitLoadFieldOrConstantFunction(Register result,
+                                       Register object,
+                                       Handle<Map> type,
+                                       Handle<String> name);
 
   // Emits code for pushing either a tagged constant, a (non-double)
   // register, or a stack slot operand.
   void EmitPushTaggedOperand(LOperand* operand);
 
   struct JumpTableEntry {
     explicit inline JumpTableEntry(Address entry)
         : label(),
           address(entry) { }
     Label label;
@@ skipping 73 matching lines @@
  private:
   LCodeGen* codegen_;
   Label entry_;
   Label exit_;
   Label* external_exit_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_LITHIUM_CODEGEN_X64_H_