Branch scratch/correct-warning-pos now bootstraps with or without native compilation.

[Alan Mackenzie]

Hello, Emacs.

The branch scratch/correct-warning-pos, which gives the correct source
position on warning messages for byte compilation, now bootstraps with
and without native compilation.

It is still a work in progress; for example, work still needs to be done
on the stripping of positions from symbols.

Also, warning messages currently display two source positions - the first
from the old method of determining them, the second the new method.

Please try out this branch, and report any problems you encounter.

Thanks!

-- 
Alan Mackenzie (Nuremberg, Germany).