Continuing the implementation of initial entries support in p4c #5041

Job	Run time
test-ubuntu18	1h 2m 7s
test-ubuntu20 (Unity ON)	32m 52s
test-ubuntu20 (Unity OFF)	4m 41s
test-ubuntu20-clang-sanitizers	1h 13m 47s
test-ubuntu22	39m 10s
test-fedora-linux	58m 59s
test-mac-os	23m 16s
	4h 54m 52s

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