compiler: add rudimentary support for multi-cond buffering #48

Job	Run time
pytest-ubuntu-py310-gcc14-omp-base	44m 23s
pytest-ubuntu-py312-gcc12-cxxomp-base	55m 54s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	37m 4s
pytest-ubuntu-py310-gcc14-omp-adjoint	30m 29s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	30m 50s
pytest-ubuntu-py312-gcc13-omp-base	50m 23s
pytest-docker-py310-gcc-omp-adjoint	24m 5s
pytest-ubuntu-py311-gcc10-noomp-base	39m 46s
pytest-docker-py310-gcc-omp-arm64-adjoint	22m 11s
pytest-osx-py312-clang-omp-base	36m 18s
pytest-ubuntu-py312-gcc13-omp-adjoint	33m 16s
pytest-ubuntu-py311-gcc10-noomp-adjoint	28m 25s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	43m 48s
pytest-ubuntu-py310-gcc9-omp-adjoint	30m 3s
pytest-docker-py310-gcc-omp-arm64-base	38m 56s
pytest-ubuntu-py313-gcc14-omp-adjoint	33m 30s
pytest-docker-py310-gcc-omp-base	36m 28s
pytest-docker-py310-icx-omp-base	31m 22s
pytest-ubuntu-py310-gcc9-omp-base	43m 26s
pytest-ubuntu-py313-gcc14-omp-base	48m 20s
pytest-docker-py310-icx-omp-adjoint	27m 12s
	12h 46m 9s

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