re PR target/54236 ([SH] Improve addc and subc insn utilization)

re PR target/54236 ([SH] Improve addc and subc insn utilization)

	PR target/54236
	* config/sh/sh.md (*addc): Rename existing variations to ...
	(*addc_r_r_1, *addc_2r_1, *addc_r_1): ... these.
	(*addc_r_lsb, *addc_r_r_lsb, *addc_r_lsb_r, *addc_2r_lsb, *addc_r_msb,
	*addc_r_r_msb, *addc_2r_msb): New insn_and_split patterns.
	* config/sh/sh.c (addsubcosts): Handle some addc special cases.

	PR target/54236
	* gcc.target/sh/pr54236-2: New.
	* gcc.target/sh/pr54089-6: Add another rotl special case.

From-SVN: r204180