[nnc] Test ability to vectorize reads from an intermediate tensor (#53752)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53752
This test doesn't work today because we don't properly vectorize
"FunctionCall" (which is the way one accesses an intermediate tensor).
ghstack-source-id: 123592860
Test Plan: `buck test //caffe2/test/cpp/tensorexpr -- LoopNest.VectorizeUse`
Reviewed By: ZolotukhinM
Differential Revision: D26895550
fbshipit-source-id: 0798ebf3e6a834bd70181732c81528455d5329fa
