bug#19554: 25.0.50; void-function xref-marker-stack-empty-p and subsequent abort

[martin rudalics]

A simpler scenario: With emacs -Q I evaluate

 (let ((params '((height . 25))))
  (make-frame params)  ;; f1
  (modify-frame-parameters (make-frame) params))  ;; f2

in *scratch*.  Gets me the now familiar

Debugger entered--Lisp error: (void-function xref-marker-stack-empty-p)
  (xref-marker-stack-empty-p)
  (not (xref-marker-stack-empty-p))
  x-create-frame(((visibility) (height . 25)))
  x-create-frame-with-faces(((height . 25)))
  make-frame(((height . 25)))
  (let ((params (quote ((height . 25))))) (make-frame params) 
(modify-frame-parameters (make-frame) params))
  eval((let ((params (quote ((height . 25))))) (make-frame params) 
(modify-frame-parameters (make-frame) params)) nil)
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  funcall-interactively(eval-last-sexp nil)
  call-interactively(eval-last-sexp nil nil)
  command-execute(eval-last-sexp)

martin