[Explicit Module Builds] Specify which Clang module dependencies are bridging header dependencies #1571
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When passing in '-explicit-swift-module-map-file', specify which Clang modules are dependencies of textual headers of the main module and binary Swift module dependencies. This relies on a new entry-point in 'libSwiftScan': 'swiftscan_swift_binary_detail_get_header_dependency_module_dependencies'. The compiler will then use this information to determine which Clang modules require an explicit '-fmodule-map-file' ClangImporter input.
Companion to the compiler's: swiftlang/swift#72668