catches failure on nvprim speculative lowering (#85580)
Fixes #85517
Added a try/catch exception during tracing `get_isolated_graphmodule` inside `_is_func_unsupported_nvfuser`. Stops speculative lowering to nvprim when query errors out.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85580
Approved by: https://github.com/mruberry, https://github.com/IvanYashchuk
