bug#26459: 26.0.50; loaddefs.el is regenerated after each "git pull"

[Glenn Morris]

Glenn Morris wrote:

> Actually, I think it would be better to make the "write to a tempfile"
> aspect internal to Emacs, the same as it is for byte-compile-file.
> Then all loaddefs generation would get the benefit.

Oh, I have a vague memory that maybe autoload generation writes the
output file more than once, in which case that wouldn't work (unless it
was changed not to, which might be good).