Cosmetic: Add macros for NaN, undefined and Infinity to native js code.

src/debug-debugger.js

 // Copyright 2012 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 430 matching lines @@
           source_line.match(sourceLineBeginningSkip)[0].length;
     }
     column = script.sourceColumnStart_[line];
   }
 
   // Convert the line and column into an absolute position within the script.
   var position = Debug.findScriptSourcePosition(script, this.line(), column);
 
   // If the position is not found in the script (the script might be shorter
   // than it used to be) just ignore it.
-  if (position === null) return;
+  if (IS_NULL(position)) return;
 
   // Create a break point object and set the break point.
   break_point = MakeBreakPoint(position, this);
   break_point.setIgnoreCount(this.ignoreCount());
   var actual_position = %SetScriptBreakPoint(script, position,
                                              this.position_alignment_,
                                              break_point);
   if (IS_UNDEFINED(actual_position)) {
     actual_position = position;
   }
@@ skipping 1595 matching lines @@
     } else if (value_description.type == NUMBER_TYPE) {
       return Number(value_description.stringDescription);
     } if (value_description.type == STRING_TYPE) {
       return String(value_description.stringDescription);
     } else {
       throw new Error("Unknown type");
     }
   } else if ("value" in value_description) {
     return value_description.value;
   } else if (value_description.type == UNDEFINED_TYPE) {
-    return void 0;
+    return UNDEFINED;
   } else if (value_description.type == NULL_TYPE) {
     return null;
   } else {
     throw new Error("Failed to parse value description");
   }
 };
 
 
 DebugCommandProcessor.prototype.setVariableValueRequest_ =
     function(request, response) {
@@ skipping 556 matching lines @@
 
     default:
       json = null;
   }
   return json;
 }
 
 Debug.TestApi = {
   CommandProcessorResolveValue: DebugCommandProcessor.resolveValue_
 };