[Bug sanitizer/81125] New: [7/8 Regression] -fsanitize=undefined ICE

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81125

            Bug ID: 81125
           Summary: [7/8 Regression] -fsanitize=undefined ICE
           Product: gcc
           Version: 7.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at 
gcc dot gnu.org
  Target Milestone: ---

#ifdef __SIZEOF_INT128__
typedef __int128 T;
#else
typedef long long int T;
#endif
struct A
{
  A (long);
  T a;
};
A::A(long c) { long b = a % c; }

ICEs with -fsanitize=undefined on x86_64-linux with both -m32 and -m64 starting
with r245945.  Reduced from i686-linux bootstrap-ubsan ICE on stor-layout.c.