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/V3Broken.cpp

@@ -140,7 +140,7 @@ bool V3Broken::isLinkable(const AstNode* nodep) { return s_linkableTable.isLinka
 //######################################################################
 // Mark every node in the tree
 
-class BrokenMarkVisitor final : public AstNVisitor {
+class BrokenMarkVisitor final : public VNVisitor {
 private:
     const uint8_t m_brokenCntCurrent = s_brokenCntGlobal.get();
 
@@ -166,7 +166,7 @@ public:
 //######################################################################
 // Check every node in tree
 
-class BrokenCheckVisitor final : public AstNVisitor {
+class BrokenCheckVisitor final : public VNVisitor {
     bool m_inScope = false;  // Under AstScope
 
     // Constants for marking we are under/not under a node