Fix speedup of typedarray-length loading in the ICs as well as Crankshaft

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 1ea3f412f815333e8d0d6e22d7d9eb4228ca5699..cbd8e14679687455ad3dfe9e3f0459d50a8dc527 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -44,10 +44,13 @@ function OverrideFunction(object, name, f) {
 
 
 // Helper function to install a getter-only accessor property.
-function InstallGetter(object, name, getter) {
+function InstallGetter(object, name, getter, attributes) {
+  if (typeof attributes == "undefined") {
+    attributes = DONT_ENUM;
+  }
   %FunctionSetName(getter, name);
   %FunctionRemovePrototype(getter);
-  %DefineAccessorPropertyUnchecked(object, name, getter, null, DONT_ENUM);
+  %DefineAccessorPropertyUnchecked(object, name, getter, null, attributes);
   %SetNativeFlag(getter);
 }