The costs for movt and movrt type of insns were not correctly reported
and ifcvt thus made some bad choices for SH.  A new cset_zero pattern
variant is also required to fix the matching for some recent changes
in the middle end.
 
gcc/
	PR target/51244
	* config/sh/sh.c (sh_movt_set_dest, sh_movrt_set_dest): Add overloads.
	(sh_rtx_costs): Handle SET of movt and movrt patterns.
	* cnofig/sh/sh-protos.h (sh_movt_set_dest, sh_movrt_set_dest): Forward
	declare new overloads.
	* config/sh/sh.md (*cset_zero): Add variant that takes a treg_set_expr
	operand.

gcc/testsuite/
	PR target/51244
	* gcc.target/sh/pr51244-11.c: Add more detailed expected insn matching.

From-SVN: r240471