[Bug target/84041] [nvptx] Hang in for-3.c

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84041

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #4)
> A conservative fix is to define the memory_barrier insn as membar.sys.

Filed PR85341 - "[nvptx] Implement atomic load" to fix this more optimally.