s390: Convert from sync to atomic optabs

s390: Convert from sync to atomic optabs

        * config/s390/s390.c (s390_emit_compare_and_swap): Update for
        atomic_compare_and_swapsi_internal name change.
        (s390_expand_insv): Try RISBG last, not requiring operands in
        registers but forcing them there.  Try a limited form of ICM.
        (s390_two_part_insv): New.
        (s390_expand_cs_hqi): Use it.  Update for atomic optabs.
        * config/s390/s390.md (UNSPEC_MOVA): New.
        (TDSI): Remove mode iterator.
        (DGPR, DINT, TDI): New mode iterators.
        (td): New mode attribute.
        (mem_signal_fence): New.
        (mem_thread_fence): Rename from memory_barrier; update for model arg.
        (mem_thread_fence_1): Rename from *memory_barrier.
        (atomic_load<DINT>, atomic_store<DINT>): New expanders.
        (atomic_loaddi_1, atomic_loadti_1): New.
        (atomic_storedi_1, atomic_storeti_1): New.
        (sync_compare_and_swap<TDSI>, sync_compare_and_swap<HQI>): Remove.
        (atomic_compare_and_swap<DGPR>, atomic_compare_and_swap<HQI>): New.
        (atomic_compare_and_swap<DGPR>_internal): New.
        (*sync_compare_and_swap<DW>, *sync_compare_and_swap<GPR>): Remove.
        (*atomic_compare_and_swap<TDI>_1): New.
        (*atomic_compare_and_swapdi_2, *atomic_compare_and_swapsi_3): New.
        (sync_<ATOMIC_Z196><GPR>, sync_old_<ATOMIC_Z196><GPR>): Remove.
        (atomic_fetch_<ATOMIC_Z196><GPR>): New.
        (atomic_fetch_<ATOMC_Z196><GPR>_iaf): New.
        (sync_<ATOMIC><HQI>, sync_old_<ATOMIC><HQI>): Remove.
        (sync_new_<ATOMIC><HQI>): Remove.
        (atomic_<ATOMIC><HQI>, atomic_fetch_<ATOMIC><HQI>): New.
        (atomic_<ATOMIC>_fetch<HQI>): New.
        (sync_lock_test_and_set<HQI>): Remove.
        (atomic_exchange<HQI>): New.

From-SVN: r190209