re PR target/44749 (mep-elf fails to build)

re PR target/44749 (mep-elf fails to build)

        PR target/44749
        * config/mep/mep-protos.h (mep_legitimize_reload_address): Always
        declare.  Change type of argument four to type int.
        (mep_secondary_input_reload_class): Returns enum reg_class.
        (mep_secondary_output_reload_class): Likewise.
        (mep_function_value): Change types of arguments to cont_tree.
        * config/mep/mep.c (mep_legitimize_reload_address): Change type of
        argument four to type int.
        (mep_secondary_input_reload_class): Returns enum reg_class.
        (mep_secondary_output_reload_class): Likewise.
        (mep_function_value): Change types of arguments to cont_tree.
        * config/mep/mep.h (REGNO_REG_CLASS): Cast return value of
        mep_regno_reg_class to enum reg_class.

From-SVN: r166614