Expose SIMD.Float32x4 type to Javascript.

test/mjsunit/messages.js

Index: test/mjsunit/messages.js
diff --git a/test/mjsunit/messages.js b/test/mjsunit/messages.js
index c30e59f3e17a6a755531c43d192b00a82821a630..9b3ca18d7b1b82b308b10b570695bce7530ec673 100644
--- a/test/mjsunit/messages.js
+++ b/test/mjsunit/messages.js
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --stack-size=100 --harmony --harmony-reflect --harmony-arrays
-// Flags: --harmony-regexps --strong-mode
+// Flags: --harmony-regexps --harmony-simd --strong-mode
 
 function test(f, expected, type) {
   try {
@@ -323,6 +323,11 @@ test(function() {
   1 + Symbol();
 }, "Cannot convert a Symbol value to a number", TypeError);
 
+// kSimdToNumber
+test(function() {
+  1 + SIMD.float32x4(1, 2, 3, 4);
+}, "Cannot convert a SIMD value to a number", TypeError);
+
 // kUndefinedOrNullToObject
 test(function() {
   Array.prototype.toString.call(null);