ASTScope: Fix linker error when building without asserts

Author: slavapestov

lib/AST/UnqualifiedLookup.cpp

@@ -778,6 +778,8 @@ unsigned UnqualifiedLookupFactory::lookupCounter = 0;
 // set to ~0 when not debugging
 const unsigned UnqualifiedLookupFactory::targetLookup = ~0;
 
+#endif // NDEBUG
+
 namespace {
 
 class ASTScopeDeclConsumerForLocalLookup
@@ -831,6 +833,4 @@ ValueDecl *ASTScope::lookupSingleLocalDecl(SourceFile *sf, DeclName name,
   if (result.size() != 1)
     return nullptr;
   return result[0];
-}
-
-#endif // NDEBUG
+}