But then I noticed this comment in 'query-replace':

	   ;; These are done separately here
	   ;; so that command-history will record these expressions
	   ;; rather than the values they had this time.

And indeed this patch broke this feature, so region boundaries
are saved as numbers in command-history for repeat-complex-command
instead of such code:

  C-x M-: (query-replace "a" "z" nil (if (use-region-p) (region-beginning)) (if (use-region-p) (region-end)) nil nil)

But anyway this feature was broken by design and never worked:
with a compiled replace.el it saves region boundaries as numbers,
and only when 'query-replace' is manually evaluated with 'eval-defun',
only then region boundaries are saved as code to command-history.

So we could just delete 'fix_command' from callint.c,
and don't worry about such cases.