Steven Wu 4125e8c3cd [ScanDependencies] Get accurate macro dependency ...

Build an accurate macro dependency for swift caching. Specifically, do
not include not used macro plugins into the dependency, which might
cause false negatives for cache hits.

This also builds the foundation for future improvement when dependency
scanning will determine the macro plugin to load and swift-frontend do
not need to redo the work.

rdar://127116512

2024-06-27 10:45:14 -07:00

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