Replaced DateFromTime and isNaN with macro calls in date code.

Review URL: http://codereview.chromium.org/150021

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2294 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/macros.py

@@ -113,6 +113,10 @@ const REGEXP_FIRST_CAPTURE = 3;
 # REGEXP_NUMBER_OF_CAPTURES
 macro NUMBER_OF_CAPTURES(array) = ((array)[0]);
 
+# Gets the value of a Date object. If arg is not a Date object
+# a type error is thrown.
+macro DATE_VALUE(arg) = (%_ClassOf(arg) === 'Date' ? %_ValueOf(arg) : ThrowDateTypeError());
+
 # Last input and last subject are after the captures so we can omit them on
 # results returned from global searches.  Beware - these evaluate their
 # arguments twice.