s390: Implement extzv for z10

s390: Implement extzv for z10

        * config/s390/predicates.md (nonzero_shift_count_operand): New.
        * config/s390/s390-protos.h (s390_extzv_shift_ok): Declare.
        * config/s390/s390.c (s390_extzv_shift_ok): New function.
        * config/s390/s390.md (extzv): New expander.
        (*extzv<GPR>_zEC12, *extzv<GPR>_z10): New insns.
        (*pre_z10_extzv<GPR>): Rename from *extzv<GPR>; simplify with
        nonzero_shift_count_operand.
        (*extzv_<mode>_srl, *extzv_<mode>_sll): New insns.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@194644 138bc75d-0d04-0410-961f-82ee72b054a4