This serie: - drastically reduce winedbg attachement time when lots of modulesi or exported symbols are present (current use case here reduces from 12 seconds to less than a second) - fixes a crash in dbghelp.
-- v2: dbghelp: Don't crash on stripped image without DEBUG directories. dbghelp: Add public symbols out of export table when no debug info is present. winedbg: Simplify fetching module name.