byte-compiling files loaded in loadup.el

[Dan Nicolaescu]

A little experiment shows that byte compiling any of the files in
loadup.el that are currently not byte compiled (and not explicitly
excluded by loading the .el version) the pure size grows a little bit.

This means that there are a few extra objects that do not need to be
garbage collected every single time the garbage collector runs.

This is a small win, but it's free, so we should remove the
no-byte-compile marker in all these files.