Port SIMD types from dart:scalarlist to dart:typeddata.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 6c4cbf5d98fa55b89c7f915a9083d65f132a2c80..4f1b89157cefa28b8b8e46220dc29ff583918d39 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -5051,6 +5051,7 @@ class TypedData : public Instance {
   TYPED_GETTER_SETTER(Uint64, uint64_t)
   TYPED_GETTER_SETTER(Float32, float)
   TYPED_GETTER_SETTER(Float64, double)
+  TYPED_GETTER_SETTER(Float32x4, simd128_value_t)
 
   static intptr_t length_offset() {
     return OFFSET_OF(RawTypedData, length_);
@@ -5147,6 +5148,7 @@ class ExternalTypedData : public Instance {
   TYPED_GETTER_SETTER(Uint64, uint64_t)
   TYPED_GETTER_SETTER(Float32, float)
   TYPED_GETTER_SETTER(Float64, double)
+  TYPED_GETTER_SETTER(Float32x4, simd128_value_t);
 
   FinalizablePersistentHandle* AddFinalizer(
       void* peer, Dart_WeakPersistentHandleFinalizer callback) const;