drm/radeon: Don't generate new fence for page flip.
Use the fence of the new frontbuffer, if any. Generating a new fence could cause us to wait for completely unrelated rendering to finish before performing the flip. Signed-off-by: NMichel Dänzer <michel.daenzer@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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