re PR fortran/46945 (gfortran.dg/unpack_zerosize_1.f90 FAILs with -ftree-vrp -fno-tree-ccp -fno-tree-fre)

	PR fortran/46945
	* trans-array.c (gfc_array_init_size): Perform stride overflow
	checking and multiplication by element_size in size_type_node instead
	of sizetype, return value with size_type_node type instead of
	sometimes with sizetype and sometimes with gfc_array_index_type.

	* gfortran.dg/pr46945.f90: New test.

From-SVN: r167871