(byte-compile-eval): Adjust to changes in load-history

The `function-history` patch introduced a regression which caused
spurious compiler warnings.  Fix it.
The new code also fixes a bug in the old code, thus causing some
new non-spurious warnings.  Fix them as well.

* lisp/emacs-lisp/bytecomp.el (byte-compile-eval): Adjust to changes in
`load-history`.

* lisp/gnus/gnus-group.el (nnrss-discover-feed)
(nnrss-save-server-data): Use `declare-function`.

* lisp/cedet/semantic/wisent/comp.el (wisent-defcontext)
(wisent-with-context):
* lisp/emacs-lisp/comp.el (comp-op-case): Silence compiler warning.

lisp/emacs-lisp/bytecomp.el

@@ -1031,30 +1031,23 @@ Each function's symbol gets added to `byte-compile-noruntime-functions'."
 	(hist-nil-orig current-load-list))
     (prog1 (eval form lexical-binding)
       (when (byte-compile-warning-enabled-p 'noruntime)
-	(let ((hist-new load-history)
-	      (hist-nil-new current-load-list))
+	(let* ((hist-new
+	        ;; Get new `current-load-list' for the locally defined funs.
+	        (cons (butlast current-load-list
+	                       (length hist-nil-orig))
+	              load-history)))
 	  ;; Go through load-history, look for newly loaded files
 	  ;; and mark all the functions defined therein.
 	  (while (and hist-new (not (eq hist-new hist-orig)))
-	    (let ((xs (pop hist-new))
-		  old-autoloads)
+	    (let ((xs (pop hist-new)))
 	      ;; Make sure the file was not already loaded before.
 	      (unless (assoc (car xs) hist-orig)
 		(dolist (s xs)
-		  (cond
-		   ((and (consp s) (eq t (car s)))
-		    (push (cdr s) old-autoloads))
-		   ((and (consp s) (memq (car s) '(autoload defun)))
-		    (unless (memq (cdr s) old-autoloads)
-                      (push (cdr s) byte-compile-noruntime-functions))))))))
-	  ;; Go through current-load-list for the locally defined funs.
-	  (let (old-autoloads)
-	    (while (and hist-nil-new (not (eq hist-nil-new hist-nil-orig)))
-	      (let ((s (pop hist-nil-new)))
-		(when (and (symbolp s) (not (memq s old-autoloads)))
-		  (push s byte-compile-noruntime-functions))
-		(when (and (consp s) (eq t (car s)))
-                  (push (cdr s) old-autoloads))))))))))
+		  (pcase s
+		    (`(defun . ,f)
+		     (unless (seq-some #'autoloadp
+		                       (get (cdr s) 'function-history))
+                       (push f byte-compile-noruntime-functions)))))))))))))
 
 (defun byte-compile-eval-before-compile (form)
   "Evaluate FORM for `eval-and-compile'."

lisp/emacs-lisp/comp.el

@@ -1767,6 +1767,7 @@ This is responsible for generating the proper stack adjustment, when known,
 and the annotation emission."
   (declare (debug (body))
            (indent defun))
+  (declare-function comp-body-eff nil (body op-name sp-delta))
   `(pcase op
      ,@(cl-loop for (op . body) in cases
 		for sp-delta = (gethash op comp-op-stack-info)