Add source position recording for variable loads

src/full-codegen.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 426 matching lines @@
 
   // Platform-specific code for loading variables.
   void EmitLoadGlobalSlotCheckExtensions(Slot* slot,
                                          TypeofState typeof_state,
                                          Label* slow);
   MemOperand ContextSlotOperandCheckExtensions(Slot* slot, Label* slow);
   void EmitDynamicLoadFromSlotFastCase(Slot* slot,
                                        TypeofState typeof_state,
                                        Label* slow,
                                        Label* done);
-  void EmitVariableLoad(Variable* expr);
+  void EmitVariableLoad(VariableProxy* proxy);
 
   enum ResolveEvalFlag {
     SKIP_CONTEXT_LOOKUP,
     PERFORM_CONTEXT_LOOKUP
   };
 
   // Expects the arguments and the function already pushed.
   void EmitResolvePossiblyDirectEval(ResolveEvalFlag flag, int arg_count);
 
   // Platform-specific support for allocating a new closure based on
@@ skipping 301 matching lines @@
 
   friend class NestedStatement;
 
   DISALLOW_COPY_AND_ASSIGN(FullCodeGenerator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FULL_CODEGEN_H_