deduplicate in _dag_to_compiled_func #1885

Job	Run time
Ruff	18s
Typos	14s
Pytest Conda Py3 POCL	2m 22s
basedpyright	2m 7s
Tests for downstream project mirgecom_examples	14s
Examples Conda Py3	1m 28s
Documentation	1m 49s
Tests for downstream project mirgecom	5s
Pytest Conda Py3 Intel	2m 14s
Tests for downstream project grudge	10m 8s
Tests for downstream project meshmode	11m 20s
	32m 19s

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