* hooks.c (hook_int_void_no_regs): Rename from
        hook_reg_class_void_no_regs; change return type.
        * hooks.h: Update.
        * target-def.h (TARGET_BRANCH_TARGET_REGISTER_CLASS): Update.
        * target.h (branch_target_register_class): Change return type to int.
        Add documentation.
        * config/sh/sh.c (sh_target_reg_class): Change return type.
        * doc/tm.texi (TARGET_BRANCH_TARGET_REGISTER_CLASS): Likewise.

From-SVN: r68275