Adding ThisFunction expression to top-level compiler.

src/fast-codegen.cc

 // Copyright 2009 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 536 matching lines @@
 void FastCodeGenerator::VisitCatchExtensionObject(CatchExtensionObject* expr) {
   UNREACHABLE();
 }
 
 
 void FastCodeGenerator::VisitThrow(Throw* expr) {
   UNREACHABLE();
 }
 
 
-void FastCodeGenerator::VisitThisFunction(ThisFunction* expr) {
-  UNREACHABLE();
-}
-
-
 #undef __
 
 
 } }  // namespace v8::internal