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c1755f53 - Increase multiplier to 3 for Inductor AMP FP16 benchmark correctness check (#135932)

Increase multiplier to 3 for Inductor AMP FP16 benchmark correctness check (#135932) Summary: Fix https://github.com/pytorch/pytorch/issues/135657. Aligned with AMP BF16, using multiplier 3 for Inductor AMP FP16 benchmark correctness check X-link: https://github.com/pytorch/pytorch/pull/135932 Approved by: https://github.com/CaoE, https://github.com/jgong5, https://github.com/jansel Reviewed By: jeanschmidt Differential Revision: D62980154 fbshipit-source-id: e7fb9cd8faea933ff85fb1173620bf0d54ebf9f1