ocl: pointer-arithmetic for device-pointers #1507

Job	Run time
build-on-cuda (OPENMP=ON)	8m 34s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, openmpi)	5m 17s
build-on-opencl (OPENMP=ON, SMM=libxsmm)	7m 56s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, mpich)	4m 10s
build-on-rocm (OPENMP=ON, G2G=ON)	3m 36s
pre-commit	1m 4s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, openmpi)	5m 6s
build-on-rocm (OPENMP=ON, G2G=OFF)	3m 42s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, mpich)	4m 1s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, openmpi)	9m 17s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, mpich)	9m 26s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, openmpi)	8m 56s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, mpich)	9m 15s
build-and-test (MPI=OFF, OPENMP=ON, SMM=blas, openmpi)	5m 15s
build-and-test (MPI=OFF, OPENMP=ON, SMM=libxsmm, openmpi)	5m 33s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=blas, openmpi)	3m 29s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=libxsmm, openmpi)	3m 14s
Combine & check coverage.	55s
	1h 38m 46s

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