Artem Chikin 7017034d20 [Dependency Scanning] Add tracking of the number of dependency queries and emit them as remarks ...

This change adds collection of three metrics to the scanner:
- number of Swift module lookups
- number of named Clang module lookups
- recorded number of Clang modules which were imported into a Swift module by name

It introduces '-Rdependency-scan', which acts as a super-set flag to the existing '-Rdependency-scan-cache' and adds emission of the above metrics as remarks when this flag is enabled. Followup changes will add further remarks about dependency scanner progress.

2025-12-17 12:50:33 -08:00

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