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Generate a uniform buffer that will receive the lengths of all storage buffers, and use this to implement calls to arrayLength(). The transform is provided with a set of mappings from storage buffer binding points to the corresponding index into the array of buffer lengths. The transform reports whether it generated the uniform buffers or not. Use this transform from the MSL sanitizer, using the binding number as the index into the array. This matches the behavior of spirv-cross, and so works with how Dawn already produces this uniform buffer. Bug: tint:256 Change-Id: I2682d2d024e8daa30f78270b8cfb6bbb32632133 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/54480 Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: James Price <jrprice@google.com> Reviewed-by: Ben Clayton <bclayton@google.com>