The attached testcase generates a segfault during alias analysis run as part of
the DSE pass.

Command line options:

/scratch/rearnsha/gnu/gcc-eabi/git/gcc/cc1 -quiet -nostdinc -v -I
-I . -imultilib fpu -iprefix
/scratch/rearnsha/gnu/gcc-eabi/git/gcc/../lib/gcc/arm-eabi/4.6.0/ -isystem
/scratch/rearnsha/gnu/gcc-eabi/git/gcc/include -isystem
/scratch/rearnsha/gnu/gcc-eabi/git/gcc/include-fixed -D__USES_INITFINI__ -D
__linux__ -D __KERNEL__ -D CONFIG_ARCH_S390X -D CONFIG_ARCH_S390 -U __i386__ -U
__x86_64__ -D KBUILD_BASENAME=memory -isystem
/scratch/rearnsha/gnu/testinstall/arm-eabi/sys-include -iwithprefix include 
-quiet -dumpbase memory.c -mcpu=arm1136jf-s -marm -mfpu=vfp -mfloat-abi=hard
-auxbase-strip memory.o -O3 -w -version -fno-short-enums -fno-strict-aliasing
-fno-common -fomit-frame-pointer besttry.c

Testcase is from CSiBE.

           Summary: [4.6 regression] ICE during tree_ssa_dse
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rearnsha at gcc dot gnu dot org
GCC target triplet: arm-eabi

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