7080020 adds new constructors to InternalError and VirtualMachineError but as VirtualMachineError doesn't specify its serialVersionUID then it is changed by the addition of these constructors:

JDK7 and older:
java.lang.VirtualMachineError: static final long serialVersionUID = 4161983926571568670L;

jdk8/tl:
java.lang.VirtualMachineError: static final long serialVersionUID = -8070910810128390498L;

As most of the errors that extend VirtualMachineError always do not declare a serialVersionUID then their value changes too.