compiler: fix msd thickness lowering #490

Job	Run time
pytest-docker-py310-gcc-omp-arm64-base	33m 16s
pytest-docker-py310-gcc-omp-base	41m 17s
pytest-docker-py310-gcc-omp-adjoint	31m 37s
pytest-ubuntu-py310-gcc14-omp-adjoint	36m 17s
pytest-ubuntu-py310-gcc9-omp-base	49m 46s
pytest-ubuntu-py312-gcc12-cxxomp-base	1h 0m 26s
pytest-docker-py310-icx-omp-adjoint	30m 48s
pytest-ubuntu-py312-gcc13-omp-base	53m 48s
pytest-ubuntu-py310-gcc9-omp-adjoint	33m 25s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	36m 55s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	44m 17s
pytest-docker-py310-gcc-omp-arm64-adjoint	26m 15s
pytest-docker-py310-icx-omp-base	43m 55s
pytest-ubuntu-py311-gcc10-noomp-base	45m 2s
pytest-osx-py312-clang-omp-base	39m 16s
pytest-ubuntu-py313-gcc14-omp-adjoint	40m 3s
pytest-ubuntu-py312-gcc13-omp-adjoint	41m 26s
pytest-ubuntu-py311-gcc10-noomp-adjoint	34m 6s
pytest-ubuntu-py313-gcc14-omp-base	53m 6s
pytest-ubuntu-py310-gcc14-omp-base	46m 52s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	49m 54s
	14h 31m 47s

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