dwarfdump: Match the --uuid output with that of Darwin dwarfdump.
This option is widely used by scripts and there is no reason to break them.

rdar://problem/36032398

llvm-svn: 321901
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp b/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
index eb23ca8..cbcb32c 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
@@ -82,7 +82,8 @@
       OS << "UUID: ";
       memcpy(&UUID, LC.Ptr+sizeof(LC.C), sizeof(UUID));
       OS.write_uuid(UUID);
-      OS << ' ' << MachO->getFileFormatName();
+      Triple T = MachO->getArchTriple();
+      OS << " (" << T.getArchName() << ')';
       OS << ' ' << MachO->getFileName() << '\n';
     }
   }