Internals: More const. No functional change intended.

src/V3Descope.cpp

@@ -39,7 +39,7 @@ private:
     // NODE STATE
     //  Cleared entire netlist
     //   AstCFunc::user()               // bool.  Indicates processing completed
-    AstUser1InUse m_inuser1;
+    const AstUser1InUse m_inuser1;
 
     // TYPES
     using FuncMmap = std::multimap<std::string, AstCFunc*>;