[LLDB][NFC] Add a missing namespace

This adds back a namespace to the value of a #define statement. This is needed to prevent collision with other types with the same name.

Author: walter erquinigo

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h

@@ -62,7 +62,7 @@ class SymbolFileDWARFDebugMap;
 class SymbolFileDWARFDwo;
 class SymbolFileDWARFDwp;
 
-#define DIE_IS_BEING_PARSED ((Type *)1)
+#define DIE_IS_BEING_PARSED ((lldb_private::Type *)1)
 
 class SymbolFileDWARF : public SymbolFileCommon {
   /// LLVM RTTI support.