Internals: More const. No functional change intended.

src/V3Cast.cpp

@@ -54,7 +54,7 @@ private:
     // NODE STATE
     // Entire netlist:
     //   AstNode::user()                // bool.  Indicates node is of known size
-    AstUser1InUse m_inuser1;
+    const AstUser1InUse m_inuser1;
 
     // STATE
 
@@ -203,6 +203,6 @@ public:
 
 void V3Cast::castAll(AstNetlist* nodep) {
     UINFO(2, __FUNCTION__ << ": " << endl);
-    { CastVisitor visitor{nodep}; }  // Destruct before checking
+    { const CastVisitor visitor{nodep}; }  // Destruct before checking
     V3Global::dumpCheckGlobalTree("cast", 0, v3Global.opt.dumpTreeLevel(__FILE__) >= 3);
 }