ocl: adjusted finalization-flow of OpenCL backend #1515

Job	Run time
build-on-cuda (OPENMP=ON)	8m 27s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, openmpi)	4m 30s
build-on-opencl (OPENMP=ON, SMM=libxsmm)	8m 21s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, mpich)	4m 43s
pre-commit	1m 11s
build-on-rocm (OPENMP=ON, G2G=ON)	3m 46s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, openmpi)	4m 40s
build-on-rocm (OPENMP=ON, G2G=OFF)	3m 50s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, mpich)	3m 59s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, openmpi)	9m 23s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, mpich)	9m 29s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, openmpi)	9m 11s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, mpich)	9m 28s
build-and-test (MPI=OFF, OPENMP=ON, SMM=blas, openmpi)	5m 16s
build-and-test (MPI=OFF, OPENMP=ON, SMM=libxsmm, openmpi)	5m 48s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=blas, openmpi)	3m 33s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=libxsmm, openmpi)	3m 16s
Combine & check coverage.	58s
	1h 39m 49s

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