re PR target/51244 ([SH] Inefficient conditional branch and code around T bit)

re PR target/51244 ([SH] Inefficient conditional branch and code around T bit)

	PR target/51244
	* config/sh/sh.md: Add negc extu sequence peephole.
	(movrt, movnegt, movrt_negc, nott): Use t_reg_operand predicate.
	(*movrt_negc): New insn.
	* config/sh/sync.md (atomic_test_and_set): Pass gen_t_reg_rtx to
	gen_movnegt.
	* config/sh/sh.c (expand_cbranchsi4, sh_emit_scc_to_t,
	sh_emit_compare_and_branch, sh_emit_compare_and_set): Use get_t_reg_rtx.
	(sh_expand_t_scc): Pass gen_t_reg_rtx to gen_movnegt.

	PR target/51244
	* gcc.target/sh/pr51244-5: New.
	* gcc.target/sh/pr51244-6: New.

From-SVN: r190258