[nnc] Add dummy reference to llvm::cfg::Update<BasicBlock> (#52321)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52321
We're seeing undefined references to this function in coverage builds.
I don't even know why the toolchain is trying to look for it, because it's not
actually used in our code anywhere.
Obviously dropping in a dummy reference is a workaround more than a real
solution, but I'd like to get the coverage build back online.
ghstack-source-id: 121818432
Test Plan: `buck build mode/dbgo-cov //caffe2/test/...`
Reviewed By: asuhan
Differential Revision: D26467484
fbshipit-source-id: 4de8d950b03d0818ffc317fc1bed9be8cf470352
