Add new Float32x4 type for SIMD.js.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index d0e0b83f5605f0f00ff8964263768a3b5cac2b72..4755665a888e910475f1bb9e19a1d92399439143 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1051,6 +1051,14 @@ Handle<HeapNumber> Factory::NewHeapNumber(double value,
 }
 
 
+Handle<Float32x4> Factory::NewFloat32x4(double w, double x, double y, double z,
+                                        PretenureFlag pretenure) {
+  CALL_HEAP_FUNCTION(
+      isolate(), isolate()->heap()->AllocateFloat32x4(w, x, y, z, pretenure),
+      Float32x4);
+}
+
+
 Handle<Object> Factory::NewError(const char* maker,
                                  MessageTemplate::Template template_index,
                                  Handle<Object> arg0, Handle<Object> arg1,