Compiler stack inconsistency

[Mark Evenson]

In compiling Alexandria from its git repository, I isolated the following case where the compiler fails by detecting a stack inconsistency:

;;; Stack inconsistency detected in NIL at index 240: found 4, expected 1.
(mapcar (lambda (x) 
          (handler-case 
              (elt x 0)
            (type-error () 
              :type-error)))
        (list nil #() 3))

[ehuelsmann]

(In [13117]) Fix #117: Workaround for the fact that we shouldn't be doing
UNSAFE-P checks in pass1.