Add new Float32x4 type for SIMD.js.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index d9bb5b1f1c3dcd8adc558a426151ee2bb6482cc6..d6cd4bcfe136d53b94536dbe1e35806b606cb129 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -97,6 +97,7 @@ bool Object::BooleanValue() {
   if (IsUndetectableObject()) return false;   // Undetectable object is false.
   if (IsString()) return String::cast(this)->length() != 0;
   if (IsHeapNumber()) return HeapNumber::cast(this)->HeapNumberBooleanValue();
+  if (IsFloat32x4()) return true;  // Simd value types always evaluate to true.
   return true;
 }
 
@@ -1400,6 +1401,12 @@ void HeapObject::HeapObjectShortPrint(std::ostream& os) {  // NOLINT
       os << '>';
       break;
     }
+    case FLOAT32X4_TYPE: {
+      os << "<Float32x4: ";
+      Float32x4::cast(this)->Float32x4Print(os);
+      os << ">";
+      break;
+    }
     case JS_PROXY_TYPE:
       os << "<JSProxy>";
       break;
@@ -1543,6 +1550,7 @@ void HeapObject::IterateBody(InstanceType type, int object_size,
 
     case HEAP_NUMBER_TYPE:
     case MUTABLE_HEAP_NUMBER_TYPE:
+    case FLOAT32X4_TYPE:
     case FILLER_TYPE:
     case BYTE_ARRAY_TYPE:
     case FREE_SPACE_TYPE:
@@ -1588,6 +1596,12 @@ void HeapNumber::HeapNumberPrint(std::ostream& os) {  // NOLINT
 }
 
 
+void Float32x4::Float32x4Print(std::ostream& os) {  // NOLINT
+  os << get_lane(0) << ", " << get_lane(1) << ", " << get_lane(2) << ", "
+     << get_lane(3);
+}
+
+
 String* JSReceiver::class_name() {
   if (IsJSFunction() || IsJSFunctionProxy()) {
     return GetHeap()->Function_string();