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c8bca312 - Enable emulate_precision_casts for mobilenetv2_100. (#187364)

Enable emulate_precision_casts for mobilenetv2_100. (#187364) Summary: Fixes `mobilenetv2_100 --training --amp` inductor `fail_accuracy` on MI350X (near-zero BatchNorm grads, e.g. `blocks.5.2.bn1.bias.grad`). Same class as #185676 (vit), but the **fp16** case that PR left untested — passes under bf16/fp32, fails only fp16; `emulate_precision_casts=1` fixes it (verified 2x). Also fixes the stale "(fp16 untested)" comment and extends the toggle test. X-link: https://github.com/pytorch/pytorch/pull/187364 Approved by: https://github.com/jeffdaily, https://github.com/eellison Reviewed By: georgehong Differential Revision: D109485601 fbshipit-source-id: dff14a5a29ab9a2fa44b7bda1add45deb3718bfa