bug#60768: 30.0.50; edebug-instrument-function off by one

[No Wayman]

Reproduction steps:

1. Save the following elisp to /tmp/test.el:


--8<---------------cut here---------------start------------->8---
;; -*- lexical-binding: t; -*-

;;;###autoload
(defun one ()
 "ONE"
 (1+ 0))

(defun two ()
 "TWO"
 (1+ (one)))

(defun three ()
 "THREE"
 (1+ (two)))

(provide 'test)
--8<---------------cut here---------------end--------------->8---

2. Run emacs from the command line with the following:

emacs -Q --batch -l /tmp/test.el --eval "(progn (require 'edebug) 
(edebug-instrument-function #'one))"

Expected output: Edebug: one
Actual output: Edebug: two

If you repeat the test with an additional autoload cookie added 
above function "two", function one is correctly instrumented.

If you repeat it with an autoload cookie only above function 
"three", function two is, incorrectly, instrumented.

My hunch is find-function-search-for-symbol being thrown off 
somehow.
Haven't had time to debug farther yet, though.

In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.36, cairo version 1.17.6) of 2023-01-08 built on nbook
Repository revision: 5d1e14bd8b9a11ab860937d3ab97248ddeef30b1
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 
11.0.12101005
System Description: Arch Linux

Configured using:
'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
--localstatedir=/var --mandir=/usr/share/man 
--with-gameuser=:games
--with-modules --without-libotf --without-m17n-flt 
--without-gconf
--with-native-compilation=yes --with-xinput2 
--with-x-toolkit=gtk3
--without-xaw3d --with-sound=no --with-tree-sitter --without-gpm
--without-compress-install
'--program-transform-name=s/\([ec]tags\)/\1.emacs/'
'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt 
-fexceptions
-Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
-fstack-clash-protection -fcf-protection'
LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ 
JPEG JSON
LCMS2 LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY 
PDUMPER PNG
RSVG SECCOMP SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER 
WEBP
X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB
Important settings:
 value of $LANG: en_US.UTF-8
 locale-coding-system: utf-8-unix