Fix the CPU feature detection.

test/cctest/test-cpu-ia32.cc

Index: test/cctest/test-cpu-ia32.cc
diff --git a/test/mjsunit/regress/regress-2671-1.js b/test/cctest/test-cpu-ia32.cc
similarity index 87%
copy from test/mjsunit/regress/regress-2671-1.js
copy to test/cctest/test-cpu-ia32.cc
index 042a501e5adb86cd7d868ec721edef8edde27274..245450bf92b595e417a53edff09a5849d74dd135 100644
--- a/test/mjsunit/regress/regress-2671-1.js
+++ b/test/cctest/test-cpu-ia32.cc
@@ -25,21 +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.
 
-// Flags: --allow-natives-syntax
+#include "v8.h"
 
-var y;
-function f() {
-  var a = [];
-  a[20] = 0;
-  y = 3;
-  var i = 7 * (y + -0);
-  a[i]++;
-  assertTrue(isNaN(a[i]));
-}
+#include "cctest.h"
+#include "cpu.h"
+
+using namespace v8::internal;
 
-f();
-f();
-f();
-%OptimizeFunctionOnNextCall(f);
-f();
 
+TEST(RequiredFeaturesX64) {
+  // Test for the features required by every x86 CPU in compat/legacy mode.
+  CPU cpu;
+  CHECK(cpu.has_sahf());
+}