The function was meant to find the Developer/ dir, but it found a
Developer directory nested deep inside the top-level Developer dir.
The new implementation rejects everything in Xcode.app/Developer in
broad strokes.
rdar://128571037
This patch is extracted from #74725.
The DwarfStreamer interface looks overcomplicated and has unnecessary
dependencies. This patch avoids creation of DwarfStreamer by DWARFLinker and
simplifies interface.
This patch creates DWARFLinkerBase library, places DWARFLinker code into
DWARFLinker\Classic, places DWARFLinkerParallel into DWARFLinker\Parallel.
updates BOLT to use new library. This patch is NFC.
