[Bug c++/63649] New: 5.0: ICE with init_priority

["adam at os dot inf.tu-dresden.de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63649

            Bug ID: 63649
           Summary: 5.0: ICE with init_priority
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: adam at os dot inf.tu-dresden.de

The following code causes an ICE:

struct Per_cpu_ctor_data
{
  typedef void (*Func)();
  Per_cpu_ctor_data() = default;
  void *_base;
};

class Per_cpu_data
{
private:
  typedef Per_cpu_ctor_data Ctor;
  struct Ctor_vector { void push_back(Ctor::Func func); };
  static Ctor_vector ctors;
};

template< typename T >
class Per_cpu : private Per_cpu_data
{
public:
  typedef T Type;
  Per_cpu();
  static void f1();
};

template< typename T > Per_cpu<T>::Per_cpu() { ctors.push_back(&f1); }
template< typename T > void Per_cpu<T>::f1() {}

class A { static Per_cpu<int *> a; };

static Per_cpu_ctor_data __b;
__attribute__((init_priority(0xfffe))) Per_cpu<int *> A::a;

$ g++ --version
g++ (GCC) 5.0.0 20141026 (experimental)
$ uname -m
x86_64
$ g++ -c -std=c++0x -O1 t.i
mem_space.i:31:59: internal compiler error: Segmentation fault
 __attribute__((init_priority(0xfffe))) Per_cpu<int *> A::a;
                                                           ^
0xc022af crash_signal
        ../../gcc/gcc/toplev.c:349
0x11df22c ipa_comdats
        ../../gcc/gcc/ipa-comdats.c:330
0x11df22c execute
        ../../gcc/gcc/ipa-comdats.c:371
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

I could not reduce the testcase more as the segfault would not happen.
The segfault also does not happen with -O0, and it also does not happen with
init_priority 0xffff.
Code compiles with gcc <= 4.9.