[Explicit Module Builds] Rely on swift-driver API to merge dependency graphs across targets
[Explicit Module Builds] Rely on swift-driver API to merge dependency graphs across targets

apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager