[ObjC] Only define metadata types if they don't already exist on the view #7282
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…view This eliminates a significant amount of wasted work when loading multiple images containing Objective-C from a shared cache. The time taken to load 400 images from an iOS shared cache (with an analysis hold enabled) drops from eight minutes to around six minutes.
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This eliminates a significant amount of wasted work when loading multiple images containing Objective-C from a shared cache. The time taken to load 400 images from an iOS shared cache (with an analysis hold enabled) drops from eight minutes to around six minutes.
One of several improvements towards #7276.