[Bug target/96494] [nvptx] Enable effective target sync_int_long

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96494

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
https://gcc.gnu.org/pipermail/gcc-patches/2020-August/551842.html