Initialize Date parse cache with SMI instead of double to workaround sharing mutable heap numbers i…

test/mjsunit/regress/regress-280531.js

Index: test/mjsunit/regress/regress-280531.js
diff --git a/test/cctest/test-cpu-ia32.cc b/test/mjsunit/regress/regress-280531.js
similarity index 86%
copy from test/cctest/test-cpu-ia32.cc
copy to test/mjsunit/regress/regress-280531.js
index 245450bf92b595e417a53edff09a5849d74dd135..6799574f691f9c52a266e38dfcf9b96c9d3a6ff4 100644
--- a/test/cctest/test-cpu-ia32.cc
+++ b/test/mjsunit/regress/regress-280531.js
@@ -25,16 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include "v8.h"
-
-#include "cctest.h"
-#include "cpu.h"
-
-using namespace v8::internal;
-
-
-TEST(RequiredFeaturesX64) {
-  // Test for the features required by every x86 CPU in compat/legacy mode.
-  CPU cpu;
-  CHECK(cpu.has_sahf());
-}
+var contextA = Realm.create();
+var date1 = Realm.eval(contextA, "new Date('Thu, 29 Aug 2013 00:00:00 UTC')");
+new Date('Thu, 29 Aug 2013 00:00:01 UTC');
+var date2 = Realm.eval(contextA, "new Date('Thu, 29 Aug 2013 00:00:00 UTC')");
+assertEquals(date1, date2);