[tree-ssa] Fixes bootstrap with Ada

[Pop Sébastian]

Shortly after the bootstrap failed with a new error:  
I will bootstrap my patch without ada, and investigate on this error.


stage1/xgcc -Bstage1/ -B/home/seb/work/mozilla/tree-ssa/usr//i686-pc-linux-gnu/bin/ -c -g -O2       -gnatpg -gnata -I- -I. -Iada -I../../gcc/gcc/ada ../../gcc/gcc/ada/sem_util.adb -o ada/sem_util.o
+===========================GNAT BUG DETECTED==============================+
| 3.5-tree-ssa 20030510 (merged 20030504) (i686-pc-linux-gnu) GCC error:   |
| in walk_tree, at tree-inline.c:1594                                      |
| Error detected at ../../gcc/gcc/ada/sem_util.adb:126:21                  |
| Please submit a bug report; see http://gcc.gnu.org/bugs.html.            |
| Include the entire contents of this bug box in the report.               |
| Include the exact gcc or gnatmake command that you entered.              |
| Also include sources listed below in gnatchop format                     |
| (concatenated together with no headers between files).                   |
+==========================================================================+

Please include these source files with error report
Note that list may not be accurate in some cases, 
so please double check that the problem can still 
be reproduced with the set of files listed.

../../gcc/gcc/ada/sem_util.adb
../../gcc/gcc/ada/sem_util.ads
../../gcc/gcc/ada/einfo.ads
../../gcc/gcc/ada/snames.ads
../../gcc/gcc/ada/types.ads
../../gcc/gcc/ada/uintp.ads
../../gcc/gcc/ada/alloc.ads
../../gcc/gcc/ada/table.ads
../../gcc/gcc/ada/urealp.ads
../../gcc/gcc/ada/atree.ads
../../gcc/gcc/ada/sinfo.ads
../../gcc/gcc/ada/casing.ads
../../gcc/gcc/ada/debug.ads
../../gcc/gcc/ada/errout.ads
../../gcc/gcc/ada/elists.ads
../../gcc/gcc/ada/exp_util.ads
../../gcc/gcc/ada/rtsfind.ads
../../gcc/gcc/ada/freeze.ads
../../gcc/gcc/ada/lib.ads
../../gcc/gcc/ada/lib-xref.ads
../../gcc/gcc/ada/namet.ads
../../gcc/gcc/ada/nlists.ads
../../gcc/gcc/ada/nmake.ads
../../gcc/gcc/ada/output.ads
../../gcc/gcc/ada/opt.ads
../../gcc/gcc/ada/hostparm.ads
../../gcc/gcc/ada/restrict.ads
../../gcc/gcc/ada/rident.ads
../../gcc/gcc/ada/scans.ads
../../gcc/gcc/ada/scn.ads
../../gcc/gcc/ada/sem.ads
../../gcc/gcc/ada/sem_ch8.ads
../../gcc/gcc/ada/sem_eval.ads
../../gcc/gcc/ada/sem_res.ads
../../gcc/gcc/ada/sem_type.ads
../../gcc/gcc/ada/sinput.ads
../../gcc/gcc/ada/stand.ads
../../gcc/gcc/ada/style.ads
../../gcc/gcc/ada/stringt.ads
../../gcc/gcc/ada/targparm.ads
../../gcc/gcc/ada/tbuild.ads
../../gcc/gcc/ada/ttypes.ads
../../gcc/gcc/ada/get_targ.ads
../../gcc/gcc/ada/atree.adb
../../gcc/gcc/ada/tree_io.ads

compilation abandoned