added CLI option `--debug-ipc` to log `ProcessExecutor` IPC communica… #429

Job	Run time
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	51m 26s
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	16m 47s
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	18m 35s
	1h 26m 48s

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