drm/i915/gtt: Convert WARN_ON to GEM debugging
As we presume that we have sufficient coverage of CI for new machines
and new code paths, we do not need to have user impacting WARN_ON for
programming errors inside i915_gem_gtt.c, so convert those over to
GEM_BUG_ON. This leaves the memory debugging WARN_ON in place as they
are not so easy to exercise with CI.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180215110759.28603-1-chris@chris-wilson.co.uk
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