[nnc] Test for direct usage of ramp/broadcast
Summary:
I was attempting to experiment with "manual" vectorization, and boy
was it hard. I finally came up with this, which I want to write down as a test
case. Eventually the APIs should make this easier...
Test Plan: buck test
Reviewed By: navahgar
Differential Revision: D26631189
fbshipit-source-id: c28794b25d7852890ea843fdbcaf8751648258c0
