[DWARFLinkerParallel][Reland] Add interface files, create a skeleton implementation. This patch creates skeleton implementation for the DWARFLinkerParallel. It also integrates DWARFLinkerParallel into dsymutil and llvm-dwarfutil, so that empty DWARFLinker::link() can be called. To do this new command line option is added "--linker apple/llvm". Additionally it changes existing DWARFLinker interfaces/implementations to be compatible: use Error for error reporting for the DWARFStreamer, make DWARFFile to owner of referenced resources, other small refactorings. Differential Revision: https://reviews.llvm.org/D147952
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