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)
Yeah, this was an initial spike intended to be implemented after Stef's performance PR that added Object.create.  The goal is to keep a separate package of shims (so that in the future we can have builds that are a bit smaller when folks know they only support ES5 browsers).