Expose SIMD.Float32x4 type to Javascript.

test/cctest/test-heap-profiler.cc

Index: test/cctest/test-heap-profiler.cc
diff --git a/test/cctest/test-heap-profiler.cc b/test/cctest/test-heap-profiler.cc
index 4416f38973ae1123130fb1f395fd4d5e77d2c34f..8fe65a387e02cf147f163b557e74f7dcfb9bd938 100644
--- a/test/cctest/test-heap-profiler.cc
+++ b/test/cctest/test-heap-profiler.cc
@@ -481,6 +481,22 @@ TEST(HeapSnapshotSymbol) {
 }
 
 
+TEST(HeapSnapshotFloat32x4) {
+  LocalContext env;
+  v8::HandleScope scope(env->GetIsolate());
+  v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
+
+  CompileRun("a = SIMD.float32x4(1, 2, 3, 4);\n");
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
+  CHECK(ValidateSnapshot(snapshot));
+  const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
+  const v8::HeapGraphNode* a =
+      GetProperty(global, v8::HeapGraphEdge::kProperty, "a");
+  CHECK(a);
+  CHECK_EQ(a->GetType(), v8::HeapGraphNode::kSimdValue);
+}
+
+
 TEST(HeapSnapshotWeakCollection) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());