Change xnack to off

[eidenyoshida]

No description provided.

[doctorcolinsmith]

As a sanity check, we're looking for xnack on and off, which produces kernels. The any mode produces a single kernel that works in both modes.

[saadrahim]

I thought we are just merging in changes to default to xnack off.

[ax3l]

@ eidenyoshida @saadrahim

I think this PR caused a regression in our CI, building rocRAND like this:

mkdir build
cd build
cmake .. -DCMAKE_CXX_COMPILER=$(which hipcc)

and does not build anymore with:

[ 60%] Building CXX object library/CMakeFiles/rocrand.dir/src/rocrand.cpp.o
clang-11: error: Unsupported CUDA gpu architecture: gfx900:xnack-
clang-11: error: Unsupported CUDA gpu architecture: gfx906:xnack-
clang-11: error: Unsupported CUDA gpu architecture: gfx908:xnack-

[doctorcolinsmith]

@ax3l Thanks for reporting the regression. Until it is fixed, we recommend using the most recent released version instead of the master branch for a stable build.