Hi Eli,

I had patched the package.el also, and now the `load-hints` can boost
the emacs, especially for the emacs on windows.

The `load-hints` can reduce searching attempts by putting the matched
paths on the top of `load-path`, it won't break the original
load-path; and the patch for the `package.el` will put the installed
files into the `load-hints`.

I tested on both Ubuntu 20.04 and Windows 11, I tested the patches
with `load-hints` enabled/disabled, based on the Spacemacs
distribution, 276 packages installed, test cli is: emacs -nw --eval
"(require 'helm)",

1. On my local linux test env, disable load-hints on the package.el,
the test cli spends 6.327s; and enable load-hints then it spends
5.392s.

2. On my local Windows test env, disable load-hints on the package.el,
the test cli spends 11.769s, and enable load-hints then it spends
7.279s.

It's very effective for windows, without any break changes.

Please review the patches.  Thanks.

Best Regards, Lin