* config/tc-arm.c (implicit_it_mode): New enum.

    * config/tc-arm.c (implicit_it_mode): New enum.
        (implicit_it_mode): New global.
        (it_instruction_type): New enum.
        (arm_parse_it_mode): New function.
        (arm_long_opts): New option added.
        (arm_it): New field.
        (it_state): New enum.
        (now_it): New macro.
        (check_it_blocks_finished): New function.
        (insns[]): Use the IT Thumb opcodes for ARM too.
        (arm_cleanup): Call check_it_blocks_finished.
        (now_it_compatible): New function.
        (conditional_insn): New function.
        (set_it_insn_type): New macro.
        (set_it_insn_type_last): New macro.
        (do_it): Call automatic IT machinery functions.
        (do_t_add_sub): Likewise
        (do_t_arit3): Likewise.
        (do_t_arit3c): Likewise.
        (do_t_blx): Likewise.
        (do_t_branch): Likewise.
        (do_t_bkpt): Likewise.
        (do_t_branch23): Likewise.
        (do_t_bx): Likewise.
        (do_t_bxj): Likewise.
        (do_t_cps): Likewise.
        (do_t_cpsi): Likewise.
        (do_t_cbz): Likewise.
        (do_t_it): Likewise.
        (encode_thumb2_ldmstm): Likewise.
        (do_t_ldst): Likewise.
        (do_t_mov_cmp): Likewise.
        (do_t_mvn_tst): Likewise.
        (do_t_mul): Likewise.
        (do_t_neg): Likewise.
        (do_t_setend): Likewise.
        (do_t_shift): Likewise.
        (do_t_tb): Likewise.
        (output_it_inst): New function.
        (new_automatic_it_block): New function.
        (close_automatic_it_block): New function.
        (now_it_add_mask): New function.
        (it_fsm_pre_encode): New function.
        (handle_it_state): New function.
        (it_fsm_post_encode): New function.
        (force_automatic_it_block_close): New function.
        (in_it_block): New function.
        (md_assemble): Call automatic IT block machinery functions.
        (arm_frob_label): Likewise.
        (arm_opts): New element.
        * config/tc-arm.h (it_state): New enum.
        (current_it): New struct.
        (arm_segment_info_type): New member added.
        * doc/c-arm.texi: New option -mimplicit-it documented.

        * gas/arm/arm-it-auto.d: New test.
        * gas/arm/arm-it-auto.s: New file.
        * gas/arm/arm-it-auto-2.d: New test case.
        * gas/arm/arm-it-auto-2.s: New file.
        * gas/arm/arm-it-auto-3.d: New test case.
        * gas/arm/arm-it-auto-3.s: New file.
        * gas/arm/arm-it-bad.d: New test case.
        * gas/arm/arm-it-bad.l: New file.
        * gas/arm/arm-it-bad.s: New file.
        * gas/arm/arm-it-bad-2.d: New test case.
        * gas/arm/arm-it-bad-2.l: New file.
        * gas/arm/arm-it-bad-2.s: New file.
        * gas/arm/arm-it-bad-3.d: New test case.
        * gas/arm/arm-it-bad-3.l: New file.
        * gas/arm/arm-it-bad-3.s: New file.
        * gas/arm/thumb2_it_auto.d: New test.
        * gas/arm/thumb2_it_bad.l: Error message updated.
        * gas/arm/thumb2_it_bad_auto.d: New test.
        * gas/arm/thumb2_it.d: Comment added.
        * gas/arm/thumb2_it_bad.d: Comment added.