Adopt swift-format #151

Job	Run time
Integration tests / 5.8	12m 55s
Integration tests / 5.9	14m 35s
Soundness / API breakage check	2m 27s
Cxx interop / 5.8	1m 3s
Integration tests / 5.10	14m 28s
Benchmarks / 5.8	2m 37s
Cxx interop / 5.9	1m 9s
Integration tests / nightly-6.0	17m 7s
Benchmarks / 5.9	3m 46s
Soundness / Broken symlinks check	3s
Cxx interop / 5.10	1m 6s
Integration tests / nightly-main	17m 34s
Benchmarks / 5.10	3m 35s
Cxx interop / nightly-6.0	1m 40s
Benchmarks / nightly-6.0	4m 42s
Cxx interop / nightly-main	1m 50s
Soundness / Documentation check	2m 1s
Benchmarks / nightly-main	5m 9s
Soundness / Format check	44s
Soundness / License headers check	9s
Soundness / Unacceptable language check	5s
Unit tests / 5.8	3m 10s
Unit tests / 5.9	3m 14s
Unit tests / 5.10	3m 28s
Unit tests / nightly-6.0	4m 13s
Unit tests / nightly-main	4m 3s
	2h 6m 53s

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