Parse @unsafe nonisolated conformance #247

Job	Run time
Validate generated code	2m 47s
Run tests using swift-syntax-dev-utils (Windows)	6m 58s
Run tests using swift-syntax-dev-utils (Linux)	6m 52s
Test / Linux (6.1 - jammy)	4m 8s
Test / Linux (6.0 - jammy)	4m 8s
Test / Linux (5.10 - jammy)	4m 2s
Test / Linux (nightly-main - jammy)	4m 41s
Test / Linux (nightly-6.2 - jammy)	4m 55s
Test / Linux (nightly-6.1 - jammy)	4m 40s
Test / Linux (5.9 - jammy)	4m 0s
Test / Windows (6.1 - windows-2022)	6m 55s
Test / Windows (5.9 - windows-2022)	6m 56s
Test / Windows (6.0 - windows-2022)	6m 59s
Test / Windows (nightly - windows-2019)	7m 6s
Test / Windows (nightly-6.1 - windows-2019)	7m 0s
Soundness / Broken symlinks check	6s
Soundness / YAML lint check	5s
Soundness / Python lint check	5s
Soundness / Format check	43s
Soundness / Documentation check	4m 59s
Soundness / Shell check	31s
Soundness / Unacceptable language check	5s
Soundness / License headers check	10s
Test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Soundness / API breakage check	0s
	1h 28m 51s

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