Merge from origin/emacs-27

44c0e074f7 * doc/emacs/buffers.texi (Icomplete): Mention icomplete-mi...
68b6dad1d8 Be more aggressive in marking objects during GC
36f508f589 ; * src/xdisp.c (find_last_unchanged_at_beg_row): Fix a typo.
cc340da1fe Fix bug #41618 "(byte-compile 'foo) errors when foo is a m...
41232e6797 Avoid crashes due to bidi cache being reset during redisplay
f72bb4ce36 * lisp/tab-bar.el (switch-to-buffer-other-tab): Normalize ...
d3e0023aaa ; * etc/TODO: Fix formatting.  (Bug#41497)
a8ad94cd2f Fix mingw.org's MinGW GCC 9 warning about 'execve'

# Conflicts:
#	lisp/tab-bar.el
#	nt/inc/ms-w32.h
#	src/alloc.c

lisp/emacs-lisp/bytecomp.el

@@ -2755,14 +2755,15 @@ If FORM is a lambda or a macro, byte-compile it as a function."
         ;; Expand macros.
         (setq fun (byte-compile-preprocess fun))
         (setq fun (byte-compile-top-level fun nil 'eval))
-        (if macro (push 'macro fun))
         (if (symbolp form)
             ;; byte-compile-top-level returns an *expression* equivalent to the
             ;; `fun' expression, so we need to evaluate it, tho normally
             ;; this is not needed because the expression is just a constant
             ;; byte-code object, which is self-evaluating.
-            (fset form (eval fun t))
-          fun)))))))
+            (setq fun (eval fun t)))
+        (if macro (push 'macro fun))
+        (if (symbolp form) (fset form fun))
+        fun))))))
 
 (defun byte-compile-sexp (sexp)
   "Compile and return SEXP."