compiler: add rudimentary support for multi-cond buffering #60

Job	Run time
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	34m 33s
pytest-ubuntu-py310-gcc9-omp-adjoint	28m 14s
pytest-ubuntu-py310-gcc9-omp-base	42m 49s
pytest-docker-py310-gcc-omp-arm64-adjoint	22m 44s
pytest-ubuntu-py310-gcc14-omp-adjoint	30m 44s
pytest-ubuntu-py312-gcc13-omp-base	51m 53s
pytest-ubuntu-py310-gcc14-omp-base	44m 32s
pytest-ubuntu-py312-gcc12-cxxomp-base	54m 57s
pytest-ubuntu-py311-gcc10-noomp-base	40m 11s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	30m 32s
pytest-docker-py310-icx-omp-adjoint	26m 23s
pytest-docker-py310-gcc-omp-arm64-base	31m 42s
pytest-osx-py312-clang-omp-base	38m 41s
pytest-ubuntu-py313-gcc14-omp-base	48m 21s
pytest-ubuntu-py312-gcc13-omp-adjoint	34m 11s
pytest-ubuntu-py311-gcc10-noomp-adjoint	26m 28s
pytest-docker-py310-gcc-omp-adjoint	26m 3s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	41m 10s
pytest-ubuntu-py313-gcc14-omp-adjoint	30m 34s
pytest-docker-py310-icx-omp-base	31m 18s
pytest-docker-py310-gcc-omp-base	37m 11s
	12h 33m 11s

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