Internals: Rename Ast on non-node classes (#3262). No functional change.

This commit has the following replacements applied:

	s/\bAstUserInUseBase\b/VNUserInUseBase/g;
        s/\bAstAttrType\b/VAttrType/g;
        s/\bAstBasicDTypeKwd\b/VBasicDTypeKwd/g;
        s/\bAstDisplayType\b/VDisplayType/g;
        s/\bAstNDeleter\b/VNDeleter/g;
        s/\bAstNRelinker\b/VNRelinker/g;
        s/\bAstNVisitor\b/VNVisitor/g;
        s/\bAstPragmaType\b/VPragmaType/g;
        s/\bAstType\b/VNType/g;
        s/\bAstUser1InUse\b/VNUser1InUse/g;
        s/\bAstUser2InUse\b/VNUser2InUse/g;
        s/\bAstUser3InUse\b/VNUser3InUse/g;
        s/\bAstUser4InUse\b/VNUser4InUse/g;
        s/\bAstUser5InUse\b/VNUser5InUse/g;
        s/\bAstVarType\b/VVarType/g;

src/V3Order.cpp

@@ -152,7 +152,7 @@ static bool domainsExclusive(const AstSenTree* fromp, const AstSenTree* top) {
 
 // Predicate returning true if the LHS of the given assignment is a signal marked as clocker
 static bool isClockerAssignment(AstNodeAssign* nodep) {
-    class Visitor final : public AstNVisitor {
+    class Visitor final : public VNVisitor {
     public:
         bool m_clkAss = false;  // There is signals marked as clocker in the assignment
     private:
@@ -203,7 +203,7 @@ void OrderGraph::loopsVertexCb(V3GraphVertex* vertexp) {
 // produce a CLKDATA warning if so.
 //
 
-class OrderClkMarkVisitor final : public AstNVisitor {
+class OrderClkMarkVisitor final : public VNVisitor {
     bool m_hasClk = false;  // flag indicating whether there is clock signal on rhs
     bool m_inClocked = false;  // Currently inside a sequential block
     bool m_newClkMarked;  // Flag for deciding whether a new run is needed
@@ -356,7 +356,7 @@ public:
 // OrderBuildVisitor builds the ordering graph of the entire netlist, and
 // removes any nodes that are no longer required once the graph is built
 
-class OrderBuildVisitor final : public AstNVisitor {
+class OrderBuildVisitor final : public VNVisitor {
     // TYPES
     enum VarUsage : uint8_t { VU_CON = 0x1, VU_GEN = 0x2 };
     using VarVertexType = OrderUser::VarVertexType;
@@ -364,8 +364,8 @@ class OrderBuildVisitor final : public AstNVisitor {
     // NODE STATE
     //  AstVarScope::user1    -> OrderUser instance for variable (via m_orderUser)
     //  AstVarScope::user2    -> VarUsage within logic blocks
-    const AstUser1InUse user1InUse;
-    const AstUser2InUse user2InUse;
+    const VNUser1InUse user1InUse;
+    const VNUser2InUse user2InUse;
     AstUser1Allocator<AstVarScope, OrderUser> m_orderUser;
 
     // STATE
@@ -1041,7 +1041,7 @@ class OrderProcess final : VNDeleter {
     // NODE STATE
     //  AstNodeModule::user3  -> int: Number of AstCFuncs created under this module
     //  AstNode::user4        -> Used by V3Const::constifyExpensiveEdit
-    const AstUser3InUse user3InUse;
+    const VNUser3InUse user3InUse;
 
     // STATE
     OrderGraph& m_graph;  // The ordering graph