Add timings to matrix field broadcasting #1616
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This PR adds timings to the matrix field broadcasting. The first simple thing we could do is break this into a utilities function, and split up the tests into separate jobs. This would help, but these tests should probably be rewritten. They're allocating a bunch, it's not clear what's passing/broken/allocating from the output. The closures are probably not helping, and funny things can happen with JET tests inside
@testset
. The first thing we can do is time each one, and see if there's a major outlier.