Implement in-heap backing store for typed arrays.

src/stub-cache.cc

Index: src/stub-cache.cc
diff --git a/src/stub-cache.cc b/src/stub-cache.cc
index 6e68314be7ebd9299ceda913e2d95737e3641c40..51c716d4ed9e5e83592d5ebe8b5756fd0d3b5d05 100644
--- a/src/stub-cache.cc
+++ b/src/stub-cache.cc
@@ -1551,7 +1551,8 @@ Handle<Code> KeyedLoadStubCompiler::CompileLoadElement(
     Handle<Map> receiver_map) {
   ElementsKind elements_kind = receiver_map->elements_kind();
   if (receiver_map->has_fast_elements() ||
-      receiver_map->has_external_array_elements()) {
+      receiver_map->has_external_array_elements() ||
+      receiver_map->has_fixed_typed_array_elements()) {
     Handle<Code> stub = KeyedLoadFastElementStub(
         receiver_map->instance_type() == JS_ARRAY_TYPE,
         elements_kind).GetCode(isolate());
@@ -1576,7 +1577,8 @@ Handle<Code> KeyedStoreStubCompiler::CompileStoreElement(
   bool is_jsarray = receiver_map->instance_type() == JS_ARRAY_TYPE;
   Handle<Code> stub;
   if (receiver_map->has_fast_elements() ||
-      receiver_map->has_external_array_elements()) {
+      receiver_map->has_external_array_elements() ||
+      receiver_map->has_fixed_typed_array_elements()) {
     stub = KeyedStoreFastElementStub(
         is_jsarray,
         elements_kind,
@@ -1672,7 +1674,8 @@ void KeyedLoadStubCompiler::CompileElementHandlers(MapHandleList* receiver_maps,
       ElementsKind elements_kind = receiver_map->elements_kind();
 
       if (IsFastElementsKind(elements_kind) ||
-          IsExternalArrayElementsKind(elements_kind)) {
+          IsExternalArrayElementsKind(elements_kind) ||
+          IsFixedTypedArrayElementsKind(elements_kind)) {
         cached_stub =
             KeyedLoadFastElementStub(is_js_array,
                                      elements_kind).GetCode(isolate());
@@ -1713,7 +1716,8 @@ Handle<Code> KeyedStoreStubCompiler::CompileStoreElementPolymorphic(
           store_mode()).GetCode(isolate());
     } else {
       if (receiver_map->has_fast_elements() ||
-          receiver_map->has_external_array_elements()) {
+          receiver_map->has_external_array_elements() ||
+          receiver_map->has_fixed_typed_array_elements()) {
         cached_stub = KeyedStoreFastElementStub(
             is_js_array,
             elements_kind,