c++: Fix initlist-array12.C

	* g++.dg/cpp0x/initlist-array12.C: Fix the definition of
	initializer_list for ilp32 target.

(cherry picked from commit 4833c1adc3c7b125bf1c59e8bd8d802ac3b0d205)

gcc/testsuite/g++.dg/cpp0x/initlist-array12.C

 // PR c++/95319
 // { dg-do compile { target c++11 } }
 
+typedef decltype(sizeof(char)) size_t;
+
 namespace std {
 template <class> class initializer_list {
   int *_M_array;
-  unsigned long _M_len;
+  size_t _M_len;
 };
 template <int _Nm> struct A { typedef int _Type[_Nm]; };
 template <int _Nm> struct B { typename A<_Nm>::_Type _M_elems; };