Dwarf Debug: Remove some cargo-cult type uniquing. Scopes do not have

an ID, so this is a noop.
Thanks Manman for catching this!

llvm-svn: 204528

llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -604,7 +604,7 @@ DIE *DwarfDebug::constructScopeDIE(DwarfCompileUnit *TheCU,
     return NULL;
 
   // Unique scope where applicable.
-  DIScope DS(resolve(DIScope(Scope->getScopeNode()).getRef()));
+  DIScope DS(Scope->getScopeNode());
 
   SmallVector<DIE *, 8> Children;
   DIE *ObjectPointer = NULL;