Elide hole checks on KeyedLoads of holey double arrays.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 71d86f4ac0e8dc26de4e2bc2b66d7f20ecde97aa..ab32987780a230f01c9b9ac7106c8bf34550e2ef 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -835,6 +835,9 @@ class Isolate {
 #define NATIVE_CONTEXT_FIELD_ACCESSOR(index, type, name)            \
   Handle<type> name() {                                             \
     return Handle<type>(context()->native_context()->name(), this); \
+  }                                                                 \
+  bool is_##name(type* value) {                                     \
+    return context()->native_context()->is_##name(value);           \
   }
   NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSOR)
 #undef NATIVE_CONTEXT_FIELD_ACCESSOR
@@ -1067,6 +1070,10 @@ class Isolate {
     date_cache_ = date_cache;
   }
 
+  Map* get_initial_js_array_map(ElementsKind kind);
+
+  bool IsFastArrayConstructorPrototypeChainIntact();
+
   CodeStubInterfaceDescriptor*
       code_stub_interface_descriptor(int index);