* lisp/emacs-lisp/package.el: Reduce autoloading before compiling

* lisp/emacs-lisp/package.el: Reduce autoloading before compiling

(package--autoloads-file-name)
(package--activate-autoloads-and-load-path): New function.
(package-activate-1): Delegate autoloading and load-path
configuration to `package--activate-autoloads-and-load-path'.
(package--compile): Before compilation, call
`package--activate-autoloads-and-load-path' instead of
`package-activate-1'.