committed: renaming of target specific GNAT files

[Arnaud Charlet]

> What about opening a branch just before the tree-ssa merge so others
> can easily test aswell?  Then you'd check into the branch and merge it
> to mainline regularly (the latter wihtout testing so far of course)

Having to handle yet another branch would be too much of a burden for me.

I don't mind if people create a branch and merge my mainline changes
to this branch, but asking me to do this work is too much, my days
have unfortunately only 24 hours.

Arno