v850.c (register_is_ok_for_epilogue, [...]): New functions.

v850.c (register_is_ok_for_epilogue, [...]): New functions.

        * config/v850/v850.c (register_is_ok_for_epilogue,
        pattern_is_ok_for_epilogue, construct_restore_jr,
        pattern_is_ok_for_prologue, construct_save_jarl): New functions.

        * config/v850/v850.h (pattern_is_ok_for_prologue,
        pattern_is_ok_for_epilogue, register_is_ok_for_epilogue): New
        predicates.

        * config/v850/v850.md: Replace prologue and epilogue patterns with a
        match_parallel pattern.

        * config/v850/v850.c (output_move_single_unsigned): Cope with zero
        extending and moving between registers at the same time.

Brought over from devo.

From-SVN: r15477