drm/i915: Convert the register access tracepoint to be conditional
The TRACE_EVENT_CONDITION is supposed to generate more efficient code than if (cond) trace(), which is what we are currently using inside the register access functions. v2: Rebase onto uncore Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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