Simon Jensen 966bb63a80 make Object.assign polyfill conditional and spec compliant
Summary: Replace the non-compliant `Object.assign` with a spec compliant version from Mozilla. Since its spec compliant we can apply conditionally only when a native version is not available.

Reviewed By: yungsters

Differential Revision: D8896359

fbshipit-source-id: 4999fe3094eba2206293bbe28760a4e46cbee6aa
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