Revert of Remove SIMD.js from V8.

test/mjsunit/double-equals.js

Index: test/mjsunit/double-equals.js
diff --git a/test/mjsunit/double-equals.js b/test/mjsunit/double-equals.js
index 5f8bea380e3ec07dc426f248f7f1024b1d35c520..40d9a76b48ca4c0701418b03cc986f2d8dacf3ec 100644
--- a/test/mjsunit/double-equals.js
+++ b/test/mjsunit/double-equals.js
@@ -25,6 +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.
 
+// Flags: --harmony-simd
+
 /**
  * This test uses assert{True,False}(... == ...) instead of
  * assertEquals(..., ...) to not rely on the details of the
@@ -240,3 +242,9 @@
 testEqual(Object(s), s);
 testEqual(new Wrapper(s), s);
 testNotEqual(Object(s), Object(s));
+
+var simd = SIMD.Float32x4(1, 2, 3, 4);
+testEqual(simd, simd);
+testEqual(Object(simd), simd);
+testEqual(new Wrapper(simd), simd);
+testNotEqual(Object(simd), Object(simd));