swift
1d402d2d - [CachedDiagnostics] Optimize in case no diagnostics is emitted

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345 days ago
[CachedDiagnostics] Optimize in case no diagnostics is emitted When no diagnostics is emitted from the compilation, just use an empty object as cached diagnostics. That is an optimization for storage to avoid emitting some supporting file to recreate source manager when not needed, also save a bit time from emitting YAML file. rdar://128426132
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