Fix `JitTest.ADFormulas` intermittent failures (#35196)
Summary:
Clamp input tensor values to [3, 3] to limit how small `tanh` gradint can get
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35196
Test Plan: CI + `bin/test_jit --gtest_filter=JitTest.ADFormulas --gtest_repeat=60000 --gtest_break_on_failure`
Differential Revision: D20611256
Pulled By: malfet
fbshipit-source-id: 8640faa5d8567d6c6df8cc5df80c2e65407116eb
