Make empty generated source files descriptive #105

Job	Run time
Soundness / Swift license headers check	6s
Soundness / Check generated code	1m 18s
Benchmarks / Construct Benchmarks matrix	2s
Cxx interop / Construct Cxx interop matrix	5s
Unit tests / Construct unit test matrix	3s
Examples / Linux (5.9)	25s
Examples / Linux (5.10)	24s
Examples / Linux (6.0)	1m 4s
Examples / Linux (nightly-6.0)	1m 4s
Examples / Linux (nightly-main)	1m 2s
Examples / Windows (6.0)	2s
Examples / Windows (nightly-6.0)	2s
Examples / Windows (nightly-main)	1s
Soundness / Documentation check	1m 12s
Soundness / API breakage check	1m 13s
Soundness / Broken symlinks check	3s
Soundness / Format check	38s
Soundness / License headers check	3s
Soundness / Python lint check	4s
Soundness / Shell check	37s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	4s
Benchmarks / Benchmarks / Linux (6.0)	1m 34s
Benchmarks / Benchmarks / Linux (nightly-6.0)	1m 33s
Benchmarks / Benchmarks / Linux (nightly-main)	1m 33s
Unit tests / Unit tests / Linux (6.0)	1m 29s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 31s
Unit tests / Unit tests / Linux (nightly-main)	1m 30s
Cxx interop / Cxx interop / Linux (6.0)	1m 0s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 2s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 0s
	21m 46s

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