compiler: Default to index-mode=int32 #6765

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	39m 6s
pytest-ubuntu-py311-gcc11-noomp-adjoint	34m 18s
pytest-ubuntu-py38-gcc12-omp-base	41m 35s
pytest-ubuntu-py38-gcc12-omp-adjoint	35m 23s
pytest-ubuntu-py38-gcc7-omp-base	42m 52s
pytest-ubuntu-py38-gcc7-omp-adjoint	34m 34s
pytest-ubuntu-py310-gcc10-noomp-base	38m 14s
pytest-ubuntu-py310-gcc10-noomp-adjoint	33m 24s
pytest-ubuntu-py312-gcc13-omp-base	50m 22s
pytest-ubuntu-py312-gcc13-omp-adjoint	43m 37s
pytest-ubuntu-py39-gcc9-omp-base	39m 29s
pytest-ubuntu-py39-gcc9-omp-adjoint	33m 41s
pytest-osx-py312-clang-omp-base	1m 32s
pytest-docker-py39-gcc-omp-base	40m 36s
pytest-docker-py39-gcc-omp-adjoint	30m 51s
pytest-docker-py39-icx-omp-base	32m 59s
pytest-docker-py39-icx-omp-adjoint	31m 8s
	10h 3m 41s

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