[SH] PR 51244 - Improve T bit to reg store

[Oleg Endo]

Hello,

This improves some cases where the T bit is stored as all ones or all
zeros to a GP reg.
Tested on rev 189916 with
make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m2a-single/-mb,-m4/-ml,-m4/-mb,
-m4-single/-ml,-m4-single/-mb,-m4a-single/-ml,-m4a-single/-mb}"

and no new failures.
OK?

Cheers,
Oleg

ChangeLog:
	PR target/51244
	* config/sh/sh.md (mov_neg_si_t): Move to Scc instructions
	section.
	Use t_reg_operand predicate.  Add split for negated case.
	(ashrsi2_31): Pass get_t_reg_rtx to gen_mov_neg_si_t.
	* config/sh/sh.c (expand_ashiftrt): Likewise.

testsuite/ChangeLog:
	PR target/51244
	* gcc.target/sh/pr51244-4.c: New.
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