trunk/98059d9deac01fd3c485bdf60efac6b9121f0f5d: Fix oversized storage for reduced MSE loss (#199823)

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Linked issue or supporting maintainer Fixes #198951 BC-breaking? No. Summary (human written only) F.mse_loss with mean or sum reduction was returning a scalar that still held the full elementwise loss buffer in storage. This fixes the reduced-output setup so the result is allocated as a scalar from the start. smooth_l1_loss also has the same pattern, but I’m leaving that for a separate follow-up. Agent details (if a…

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