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

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.