Don't allocate while walking a NormalizedSnapshotSpanCollection during classification tagging #75631
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Saw this in a scrolling speedometer profile, only 0.3%, but it's trivial to remove. They don't publicly expose a struct based enumerator, but they do expose an indexer, so it's easy enough to use that to walk over the collection.
*** allocations from speedometer scrolling profile that should be removed by this change ***