Fix the CPU feature detection.

test/cctest/test-cpu-x64.cc

Index: test/cctest/test-cpu-x64.cc
diff --git a/test/mjsunit/regress/regress-crbug-242870.js b/test/cctest/test-cpu-x64.cc
similarity index 84%
copy from test/mjsunit/regress/regress-crbug-242870.js
copy to test/cctest/test-cpu-x64.cc
index 7183375ca811cedc81c870d34e694e98cf727f9b..a2c45cf8621e7aabb1879620b7a897f5a5ca56b8 100644
--- a/test/mjsunit/regress/regress-crbug-242870.js
+++ b/test/cctest/test-cpu-x64.cc
@@ -25,19 +25,20 @@
 // (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 non_const_true = true;
+#include "cctest.h"
+#include "cpu.h"
 
-function f() {
-  return (non_const_true || true && g());
-}
+using namespace v8::internal;
 
-function g() {
-  for (;;) {}
-}
 
-assertTrue(f());
-assertTrue(f());
-%OptimizeFunctionOnNextCall(f);
-assertTrue(f());
+TEST(RequiredFeaturesX64) {
+  // Test for the features required by every x64 CPU.
+  CPU cpu;
+  CHECK(cpu.has_fpu());
+  CHECK(cpu.has_cmov());
+  CHECK(cpu.has_mmx());
+  CHECK(cpu.has_sse());
+  CHECK(cpu.has_sse2());
+}