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LLUIImage vertex buffer optimization #5972

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@akleshchev

General cache lookup can be expensive, even without misses. Viewer uses a lot of UI images, drawing them from general cache incurs significant price in hash and lookup, but those images are already one of a kind and can work as their own cache. Optimize UI images to act as their own cache.

Note: on the image 'flush' actually belong to a previous call due to how LLRender works

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