[Bug target/97348] [nvptx] Make -misa=sm_35 the default

[vries at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97348

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to CVS Commits from comment #4)
>     Both build again cuda 9.1.

FWIW, tested post-commit against cuda 11.1, no issues found.