https://github.com/openjdk/jdk/blob/26efff758684b9c5615fb3b087538d713e6eca10/src/hotspot/share/classfile/verificationType.hpp#L50-L61C10

The comment mentions _handle, but there's no such field in this class

class VerificationType {
  private:
    // Least significant bits of _handle are always 0, so we use these as
    // the indicator that the _handle is valid. Otherwise, the _data field
    // contains encoded data (as specified below). Should the VM change
    // and the lower bits on oops aren't 0, the assert in the constructor
    // will catch this and we'll have to add a descriminator tag to this
    // structure.
    union {
      Symbol* _sym;
      uintptr_t _data;
    } _u;