[Mosaic GPU] Guard `bf16` <-> `f8e4m3fn`/`f8e5m2` conversions on Blackwell+ (`sm_100`+). #41863

Merged
copybara-service[bot] opened 2:52pm on October 21, 2026 wanted to merge 1 commit into google/jax main from
test_1003994976

Pull Request #41863 commits