[nnc] Do not try to vectorize kernels that use float16 (#55970)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55970
LLVM's support for float16 is not great, and we were seeing assertion
failures trying to generate code for vectorized uses. I note that clang
doesn't even try to vectorize operations involving half:
https://gcc.godbolt.org/z/86MW4xr17, so that's a good sign we shouldn't either.
Fixes #55905
ghstack-source-id: 126511474
Test Plan: pytest test_jit_fuser_te.py -k test_isnan
Reviewed By: asuhan
Differential Revision: D27752279
Pulled By: bertmaher
fbshipit-source-id: ac115080bf2a4a73d52b396d64a5bce0cf13abfe
