* arm-linux-tdep.c (arm_linux_thumb2_be_breakpoint)

	* arm-linux-tdep.c (arm_linux_thumb2_be_breakpoint)
	(arm_linux_thumb2_le_breakpoint): New constants.
	(arm_linux_init_abi): Set thumb2_breakpoint and
	thumb2_breakpoint_size.
	* arm-tdep.c (thumb_insn_size, thumb_advance_itstate): New functions.
	(thumb_get_next_pc): Add a comment.  Rename IT to ITSTATE.
	Implement support for single stepping through IT blocks if
	a 32-bit Thumb breakpoint instruction is available.
	(arm_breakpoint_from_pc): If a 32-bit Thumb breakpoint instruction
	is available, use it when needed.
	(arm_remote_breakpoint_from_pc): New function.
	(arm_gdbarch_init): Register arm_remote_breakpoint_from_pc.
	* arm-tdep.h (struct gdbarch_tdep): Correct thumb_breakpoint
	comment.  Add thumb2_breakpoint and thumb2_breakpoint_size.

	gdbserver/
	* linux-arm-low.c (thumb_breakpoint_len): Delete.
	(thumb2_breakpoint): New.
	(arm_breakpoint_at): Check for Thumb-2 breakpoints.

	testsuite/
	* gdb.arch/thumb2-it.S, gdb.arch/thumb2-it.exp: New files.