mainline with ada doesn't bootstrap

[Kelley Cook]

 > stage1/xgcc -Bstage1/
 > -B/home/bothner/GNU/install-gcc/i686-pc-linux-gnu/bin/ -c -g -O2
 > -gnatpg -gnata -I- -I. -Iada -I/home/bothner/GNU/gcc.head/gcc/ada
 > /home/bothner/GNU/gcc.head/gcc/ada/ada.ads -o ada/ada.o
 > +===========================GNAT BUG 
DETECTED==============================+
 > | 3.4 20031031 (experimental) (i686-pc-linux-gnu) Program_Error
sinput.adb:397 explicit raise|
 > | Error detected at system.ads:163:5 
       > |

I originally thought that it was from my typo in raise.c, but it still 
existed after fixing that.

After a guess hinted at by the Zack/Kenner exchange, I found that 
reverting Jan's XFMode patches fixes it.

Kelley Cook