[inductor] Pattern match cat->view*->pointwise and hoist pointwise (#90743)
Summary:
Inductor can't fuse pointwise into the output of concat, but it can
fuse into the inputs, and that's the same thing. So we hoist pointwise through
a concat (followed by an optional series of views).
Test Plan: New unit test
Differential Revision: D41901656
Pull Request resolved: https://github.com/pytorch/pytorch/pull/90743
Approved by: https://github.com/jiawenliu64, https://github.com/jansel
