Avoid having the async compile log saying it's compiling loaddefs

* lisp/loadup.el (featurep): Define the hash table in nativecomp
builds (but not otherwise).  A more natural place to define this
would be in comp.el, but comp.el isn't loaded yet when we load the
.elc file that updates comp--no-native-compile.  We could change
the load order and move the definition to comp.el, though.

* lisp/emacs-lisp/bytecomp.el (byte-compile-from-buffer): Allow
inhibiting nativecomp earlier (bug#57627).

* lisp/emacs-lisp/comp.el (native-compile-async-skip-p): Use the data.

lisp/emacs-lisp/bytecomp.el

@@ -2323,9 +2323,15 @@ With argument ARG, insert value in current buffer after the form."
        (setq case-fold-search nil))
      (displaying-byte-compile-warnings
       (with-current-buffer inbuffer
-	(and byte-compile-current-file
-	     (byte-compile-insert-header byte-compile-current-file
-                                         byte-compile--outbuffer))
+	(when byte-compile-current-file
+	  (byte-compile-insert-header byte-compile-current-file
+                                      byte-compile--outbuffer)
+          ;; Instruct native-comp to ignore this file.
+          (when (bound-and-true-p no-native-compile)
+            (with-current-buffer byte-compile--outbuffer
+              (insert
+               "(when (boundp 'comp--no-native-compile)
+  (puthash load-file-name t comp--no-native-compile))\n\n"))))
 	(goto-char (point-min))
 	;; Should we always do this?  When calling multiple files, it
 	;; would be useful to delay this warning until all have been

lisp/emacs-lisp/comp.el

@@ -4119,6 +4119,7 @@ the deferred compilation mechanism."
 LOAD and SELECTOR work as described in `native--compile-async'."
   ;; Make sure we are not already compiling `file' (bug#40838).
   (or (gethash file comp-async-compilations)
+      (gethash (file-name-with-extension file "elc") comp--no-native-compile)
       (cond
        ((null selector) nil)
        ((functionp selector) (not (funcall selector file)))