vmwgfx: Break out and comment vmw_execbuf_copy_fence_user
This function will be used also by the upcoming fence event code, so break it out and add a comment about the functionality. Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com> Reviewed-by: NJakob Bornecrantz <jakob@vmware.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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