Move global code for builtins into setup functions.

src/date.js

Index: src/date.js
diff --git a/src/date.js b/src/date.js
index c75d12c651c6d6cb2228ee78e89f70674ee19376..62999e9de63b7ee54b6716ea0b5821cebbf49867 100644
--- a/src/date.js
+++ b/src/date.js
@@ -25,20 +25,16 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-
 // This file relies on the fact that the following declarations have been made
 // in v8natives.js:
 // var $isFinite = GlobalIsFinite;
 
+var $Date = global.Date;
+
 // -------------------------------------------------------------------
 
 // This file contains date support implemented in JavaScript.
 
-// Keep reference to original values of some global properties.  This
-// has the added benefit that the code in this file is isolated from
-// changes to these properties.
-var $Date = global.Date;
-
 // Helper function to throw error.
 function ThrowDateTypeError() {
   throw new $TypeError('this is not a Date object.');
@@ -142,7 +138,7 @@ var Date_cache = {
 };
 
 
-%SetCode($Date, function(year, month, date, hours, minutes, seconds, ms) {
+function DateConstructor(year, month, date, hours, minutes, seconds, ms) {
   if (!%_IsConstructCall()) {
     // ECMA 262 - 15.9.2
     return (new $Date()).toString();
@@ -199,10 +195,7 @@ var Date_cache = {
     value = MakeDate(day, time);
     SET_LOCAL_DATE_VALUE(this, value);
   }
-});
-
-
-%FunctionSetPrototype($Date, new $Date($NaN));
+}
 
 
 var WeekDays = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
@@ -767,6 +760,10 @@ function ResetDateCache() {
 
 function SetUpDate() {
   %CheckIsBootstrapping();
+
+  %SetCode($Date, DateConstructor);
+  %FunctionSetPrototype($Date, new $Date($NaN));
+
   // Set up non-enumerable properties of the Date object itself.
   InstallFunctions($Date, DONT_ENUM, $Array(
     "UTC", DateUTC,