[Dependency Scanning] Bridge Clang dependency scanner results on-demand #83600
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Instead of always bridging all of the discovered modules of all of the queries, only do so for modules which are not already cached
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…leDependencyScanner' utility This moves the functionality of 'bridgeClangModuleDependency' into a utility in the main scanner class because it relies on various objects whose lifetime is already tied to the scanner itself.
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#83050 changed the behavior to query every Clang module identifier imported from Swift, even for modules which may have previously been discovered as transitive dependencies of another query. This means we now have a lot of results coming in from Clang scanner queries which are redundant, and we bridge them all, all of the time, which adds up to a substantial amount of time.
Instead of always bridging all of the discovered modules of all of the queries, only do so for modules which have not already been cached at the time we record query results.