[SH, committed] Fix some failing PR 51244 tests

[Oleg Endo]

Hi,

Since recently, some of the PR 51244 tests started to fail.  The
attached patch fixes that.

Tested on rev 210305 with
 make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}"

and no new failures.
Committed as rev 210535.

Cheers,
Oleg

gcc/ChangeLog:
	PR target/51244
	* config/sh/sh.c (sh_eval_treg_value): Handle t_reg_operand and
	negt_reg_operand cases.
	* config/sh/sh.md (*cset_zero): Likewise by using cbranch_treg_value
	predicate.
	* config/sh/predicates.md (cbranch_treg_value): Simplify.

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