fallback swapchain #3335

Job	Run time
macOS / Release / homebrew-clang	8m 10s
Ubuntu / Release / gcc	24m 37s
macOS / Debug / homebrew-clang	6m 0s
Ubuntu / Debug / gcc	18m 18s
macOS / Release / system-clang	6m 27s
Ubuntu / Release / clang	18m 43s
macOS / Debug / system-clang	5m 7s
Ubuntu / Debug / clang	13m 11s
Windows / Release / cl	24m 14s
Windows / Release / clang	23m 5s
Windows / Release / clang-cl	26m 42s
Windows / Debug / cl	21m 52s
Windows / Debug / clang	24m 55s
Windows / Debug / clang-cl	18m 21s
	3h 59m 42s

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