drm/i915: x86 always has writeq. Add I915_READ64 for symmetry.
i386 has inline code for writeq and readq, so just use those instead of ugly macros which evaluate arguments multiple times. Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Eric Anholt <eric@anholt.net>
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091438dd
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