[Backport 7.x.x] PBR Sky renderer now shares its internal precomputation table between different instances.#482

JulienIgnace-Unity merged 3 commits into7.x.x/hd/stagingUnity-Technologies/Graphics:7.x.x/hd/stagingfrom

7.x.x/hd/share-pbrsky-texturesUnity-Technologies/Graphics:7.x.x/hd/share-pbrsky-texturesCopy head branch name to clipboard