[ExplicitModule] Support direct cc1 flag for all explicit module build job #1550
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Update swift-driver to support directly instantiate clang importer in all jobs with cc1 flags. In the new mode, swift dependency scanner will return all the cc1 flags to the actual compilation doesn't need to run clang driver again. In this mode, swift-driver should avoid forwarding Xcc command-line options since those are expected to be clang driver args, not cc1 args.