avr-protos.h (avr_out_sbxx_branch): Declare.

	* config/avr/avr-protos.h (avr_out_sbxx_branch): Declare.
	* config/avr/avr.c (jump_over_one_insn_p): Take length of the
	branch insn into account, do not assume 1.
	(avr_out_sbxx_branch): New function.  Optimize cases of skipping
	over single word insn.  Handle upper half of I/O space too.
	* config/avr/avr.md (*sbrx_branch): Use it.
	(*sbrx_and_branchhi, *sbrx_and_branchsi): Likewise.
	(*sbix_branch, *sbix_branch_bit7): Likewise.
	(*sbix_branch_tmp, *sbix_branch_tmp_bit7): New.
	Use RTL peepholes to optimize register operand sign tests.

From-SVN: r53906