layers:Warn on buffer/image aliasing
layers:Warn on buffer/image aliasing

The Buffer-Image Granularity section of the spec details what must be
done to avoid having a linear buffer alias with a tiled image, but it
does not state that such aliasing is a definite error.

Demoting this check to a warning.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools