PDP-10 backend for gcc

[Torbjorn Granlund]

I made a quick GCC port to the pdp10 back in 1996.  I ignored the
problems of pointers, and had char, short, and int to all be 36-bit
opjects.  It uses QImode for 36-bit types, which I think is the
correct approach.

I think my port could be a starting point for a port with proper byte
handling, since it actually generates reasonable code for plain
arithmetic.  It shouldn't be take too much trouble to make it work in
current GCC.

I'll make my port available for ftp if there is interest.

-- 
Torbjörn