[iOS GPU] Add tanh and clamp to support GAN (#61383)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61383
Since we already have the support for hardtanh, it's easy to add support for clamp. GPU is 40% ish faster.
ghstack-source-id: 133113272
Test Plan:
- CI
- buck test pp-macos
Reviewed By: dhruvbird
Differential Revision: D29572933
fbshipit-source-id: d22ec09e18d02456440f552067c9a8aea9a1a8ab
