Bug 875002 - Allow shorthand properties in object literals; r=jorendorff

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extra : rebase_source : cf461ea4585b0a9fbd51f8260c4d8c4b76ed17ed
Bug 875002 - add shorthand flag to ObjectPattern in Reflect.parse;r=jorendorff

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extra : rebase_source : 5cba8a50b7937c4979dcbadf273634b63ddb2185
extra : amend_source : 8f793b4309941c49de697cb71105ae6369a27986