Missing class interface definition results misleading error message

> class x implements y
>
> compile both, then remove y.class and run "java x"
>
> get message "Can't find class x"

Even with -v -debug there is no indication that it is failing because
it was unable to find y.class. The exception condition is being set
down in Locked_ResolveClassConstant() (eventually called from
ResolveInterfaces()). However since we are still in the initialization
portion of the VM startup, we never return to any code that would attempt
to catch the exception - we return the java_main() in javai.c, print the
can't find class msg and quit.