ira-conflicts.c: Include addresses.h for the definition of base_reg_class.

        * ira-conflicts.c: Include addresses.h for the definition of
        base_reg_class.
        (ira_build_conflicts): Use base_reg_class instead of
        BASE_REG_CLASS.
        * Makefile.in: Add a dependency of ira-conflicts.o on
        addresses.h.

From-SVN: r143365