We have to include some inline function definitions. I am not sure why this only seems to be needed with VS2015.
Created attachment 259481 [details] Patch
Thanks for reviewing :)
Comment on attachment 259481 [details] Patch Clearing flags on attachment: 259481 Committed r188695: <http://trac.webkit.org/changeset/188695>
All reviewed patches have been landed. Closing bug.