wip: refactor xir #3455

Job	Run time
macOS / Release / homebrew-clang	7m 39s
macOS / Debug / homebrew-clang	5m 50s
Ubuntu / Release / gcc	20m 7s
macOS / Release / system-clang	5m 55s
Ubuntu / Debug / gcc	15m 27s
macOS / Debug / system-clang	4m 18s
Ubuntu / Release / clang	17m 18s
Ubuntu / Debug / clang	12m 59s
Windows / Release / cl	29m 15s
Windows / Release / clang	25m 54s
Windows / Release / clang-cl	17m 6s
Windows / Debug / cl	16m 10s
Windows / Debug / clang	24m 37s
Windows / Debug / clang-cl	23m 11s
	3h 45m 46s

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