fix not being able to call non-writable methods - fixes #1133

test/core/fixtures/transformation/es6.object-super/options.json

@@ -0,0 +1,3 @@
+{
+  "externalHelpers": true
+}

test/core/fixtures/transformation/es6.object-super/statically-bound/expected.js

@@ -2,10 +2,8 @@
 
 var _obj;
 
-var _get = function get(object, property, receiver) { var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { return get(parent, property, receiver); } } else if ("value" in desc && desc.writable) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } };
-
 var o = _obj = {
   m: function m() {
-    return _get(Object.getPrototypeOf(_obj), "x", this);
+    return babelHelpers.get(Object.getPrototypeOf(_obj), "x", this);
   }
 };