ocl: improved stand-alone reproducers and updated some settings #1349

Job	Run time
pre-commit	1m 29s
build-on-opencl (OPENMP=ON, SMM=libxsmm)	10m 54s
build-on-cuda (OPENMP=ON)	14m 16s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, openmpi)	8m 9s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, mpich)	6m 43s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, openmpi)	7m 57s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, mpich)	6m 25s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, openmpi)	4m 24s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, mpich)	3m 58s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, openmpi)	5m 10s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, mpich)	4m 4s
build-and-test (MPI=OFF, OPENMP=ON, SMM=blas, openmpi)	7m 12s
build-and-test (MPI=OFF, OPENMP=ON, SMM=libxsmm, openmpi)	7m 42s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=blas, openmpi)	4m 9s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=libxsmm, openmpi)	5m 24s
build-on-rocm (OPENMP=ON)	12m 2s
Combine & check coverage.	1m 46s
	1h 51m 44s

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