re PR target/25311 (ICE in reload_cse_simplify_operands, at postreload.c:393)
PR target/25311
* config/s390/s390.c (struct s390_address): New field literal_pool.
(s390_decompose_address): Compute literal_pool field. Do not
assume register %r13 is always (and solely) used as pool base.
(s390_extra_constraint_str): Use literal_pool field.
PR target/25311
* gcc.c-torture/compile/pr25311.c: New test.