s390.c: New.

s390.c: New.

        * config/s390/s390.c: New. Subroutines for code generation.
        * config/s390/s390.h: New. Definitions for s/390.
        * config/s390/s390-protos.h: New. Prototypes.
        * config/s390/linux.h: New. Definitions for linux for s/390.
        * config/s390/linux64.h: New. Definitions for linux for zSeries.
        * config/s390/t-linux: New. Makefile fragment.
        * config/s390/s390.md: New. Machine description for s/390 and zSeries.
        * config/s390/fixdfdi.h: New. Fix L_fix*di.
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From-SVN: r43980