Provide infrastructure for legacy-shims.

Adds Object.create if not present.

Used from from: [es-shims/es5-shim](https://github.com/es-shims/es5-shim/blob/80ff03e13ffcffc28176a123914a1d30fa79b69a/es5-sham.js#L175-L254)
This needs create.isSimulated to prevent some IE8 regressions: https://github.com/emberjs/ember.js/pull/5340