re PR target/63986 ([SH] gcc.target/sh/pr51244-15.c failures)

re PR target/63986 ([SH] gcc.target/sh/pr51244-15.c failures)

gcc/
	PR target/63986
	PR target/51244
	* config/sh/sh.c (sh_is_logical_t_store_expr,
	sh_try_omit_signzero_extend): Use rtx_insn* for insn argument.
	(sh_split_movrt_negc_to_movt_xor): New function.
	(sh_find_set_of_reg): Move to ...
	* config/sh/sh-protos.h (sh_find_set_of_reg): ... here and convert
	to template function.
	(set_of_reg): Use rtx_insn* for insn member.
	(sh_is_logical_t_store_expr, sh_try_omit_signzero_extend): Use
	rtx_insn* for insn argument.
	* config/sh/sh.md (movrt_negc, *movrt_negc): Split into movt-xor
	sequence using new sh_split_movrt_negc_to_movt_xor function.
	(movrt_xor): Allow also for SH2A.
	(*movt_movrt): Delete insns and splits.

From-SVN: r217968