Preserve \src attributes through ABC9 synthesis #15

Job	Run time
pre_docs_job	5s
pre_job	6s
Reusable build (ubuntu-latest)	18m 33s
Reusable build (macos-latest)	23m 41s
Try build docs	-1s
Run test_cell (ubuntu-latest)	1m 28s
Run docs tests (ubuntu-latest)	24s
Run tests (ubuntu-latest)	10m 22s
Run tests (macos-latest)	14m 51s
	1h 9m 29s

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