[SyntaxTree] Fix rtti for `Expression`.

[eduucaldas]

Rebase

[eduucaldas]

rebase

clang/include/clang/Tooling/Syntax/Nodes.h

 
 /// A base class for all expressions. Note that expressions are not statements,
 /// even though they are in clang.
 class Expression : public Tree {
 public:
   Expression(NodeKind K) : Tree(K) {}
   static bool classof(const Node *N) {
     return NodeKind::UnknownExpression <= N->getKind() &&
-           N->getKind() <= NodeKind::UnknownExpression;
+           N->getKind() <= NodeKind::CallExpression;
   }
 };
 
 /// A sequence of these specifiers make a `nested-name-specifier`.
 /// e.g. the `std` or `vector<int>` in `std::vector<int>::size`.
 class NameSpecifier : public Tree {
 public:
   NameSpecifier(NodeKind K) : Tree(K) {}