AVR: target/116407 - Fix linker error "relocation truncated to fit".

AVR: target/116407 - Fix linker error "relocation truncated to fit".

Some text peepholes output extra instructions prior to a branch
instruction and that increase the jump offset of backward branches.

	PR target/116407
gcc/
	* config/avr/avr-protos.h (avr_jump_mode): Add an int argument.
	* config/avr/avr.cc (avr_jump_mode): Add an int argument to increase
	the computed jump offset of backwards branches.
	* config/avr/avr.md (*dec-and-branchhi!=-1, *dec-and-branchsi!=-1):
	Increase the jump offset used by avr_jump_mode() as needed.
gcc/testsuite/
	* gcc.target/avr/torture/pr116407-2.c: New test.
	* gcc.target/avr/torture/pr116407-4.c: New test.