Print TMA benchmark info to stderr
Summary:
X-link: https://github.com/facebookresearch/FBGEMM/pull/301
X-link: https://github.com/pytorch/FBGEMM/pull/3202
Printing warnings to stdout mucks up the output of various tools/benchmarks
Reviewed By: xuzhao9, htyu
Differential Revision: D63643615
fbshipit-source-id: 1f34508a7fd36f5aa421e11bddd5ce77fc13038a
