Introduce {FAST,SLOW}_STRING_WRAPPER_ELEMENTS

test/cctest/test-unboxed-doubles.cc

Index: test/cctest/test-unboxed-doubles.cc
diff --git a/test/cctest/test-unboxed-doubles.cc b/test/cctest/test-unboxed-doubles.cc
index 3906d848de4f24ecfd24da18a39803f76939acba..c1edb11e87123a1e6af8a81c085c44bcbc509877 100644
--- a/test/cctest/test-unboxed-doubles.cc
+++ b/test/cctest/test-unboxed-doubles.cc
@@ -1060,7 +1060,7 @@ TEST(DoScavenge) {
   CcTest::heap()->CollectGarbage(i::NEW_SPACE);
 
   // Create temp object in the new space.
-  Handle<JSArray> temp = factory->NewJSArray(FAST_ELEMENTS);
+  Handle<JSArray> temp = factory->NewJSArray(0, FAST_ELEMENTS);
   CHECK(isolate->heap()->new_space()->Contains(*temp));
 
   // Construct a double value that looks like a pointer to the new space object
@@ -1399,7 +1399,7 @@ TEST(StoreBufferScanOnScavenge) {
   CHECK(isolate->heap()->old_space()->Contains(*obj));
 
   // Create temp object in the new space.
-  Handle<JSArray> temp = factory->NewJSArray(FAST_ELEMENTS);
+  Handle<JSArray> temp = factory->NewJSArray(0, FAST_ELEMENTS);
   CHECK(isolate->heap()->new_space()->Contains(*temp));
 
   // Construct a double value that looks like a pointer to the new space object