GCC build failure, HEAD@193110 on native

[GCC regression tester]

With your recent patch, GCC HEAD revision 193110 had problems on:
native: build (about the same as the previous build)
Attached is build output for those targets.
The previous build was of revision 193109.

Log information for changes since the last build:
------------------------------------------------------------------------
r193110 | ian | 2012-11-02 16:17:05 -0700 (Fri, 02 Nov 2012) | 2 lines
Changed paths:
   M /trunk/libgo/runtime/go-reflect-call.c

runtime: Fix reflect.Call support for 64-bit ints.

------------------------------------------------------------------------

For more information, see <http://glutton.geoffk.org/HEAD/>.

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                 from /home/regress/tbox/svn-gcc/gcc/tree-ssa-loop-niter.c:25:
/home/regress/tbox/svn-gcc/gcc/tree-ssa-loop-niter.c: In function 'void discover_iteration_bound_by_body_walk(loop*)':
/home/regress/tbox/svn-gcc/gcc/vec.h:329:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
  ((V) ? (V)->length () : 0)
                           ^
/home/regress/tbox/svn-gcc/gcc/tree-ssa-loop-niter.c:3164:21: note: in expansion of macro 'VEC_length'
   if (latch_index < VEC_length (double_int, bounds))
                     ^
cc1plus: all warnings being treated as errors
make[3]: *** [tree-ssa-loop-niter.o] Error 1
make[3]: *** Waiting for unfinished jobs....
rm gcj-dbtool.pod jcf-dump.pod jv-convert.pod grmic.pod gcov.pod gcj.pod gc-analyze.pod gfdl.pod cpp.pod gfortran.pod fsf-funding.pod gij.pod gcc.pod
make[3]: Leaving directory `/home/regress/tbox/native/build/gcc'
make[2]: *** [all-stage2-gcc] Error 2
make[2]: Leaving directory `/home/regress/tbox/native/build'
make[1]: *** [stage2-bubble] Error 2
make[1]: Leaving directory `/home/regress/tbox/native/build'
make: *** [bootstrap] Error 2
+ '[' -s .bad_compare ']'
+ exit 1
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-- 
Geoffrey Keating <geoffk@geoffk.org> 
(via an automated GCC regression-testing script.)