Move global code for builtins into setup functions.

src/symbol.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 "use strict";
 
+// This file relies on the fact that the following declaration has been made
+// in runtime.js:
+// var $Array = global.Array;
+
 var $Symbol = global.Symbol;
 
+// -------------------------------------------------------------------
+
 function SymbolConstructor(x) {
   var value =
     IS_SYMBOL(x) ? x : %CreateSymbol(IS_UNDEFINED(x) ? x : ToString(x));
   if (%_IsConstructCall()) {
     %_SetValueOf(this, value);
   } else {
     return value;
   }
 }
 
@@ skipping 30 matching lines @@
   %SetProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM);
 
   InstallGetter($Symbol.prototype, "name", SymbolGetName);
   InstallFunctions($Symbol.prototype, DONT_ENUM, $Array(
     "toString", SymbolToString,
     "valueOf", SymbolValueOf
   ));
 }
 
 SetUpSymbol();