[SH] PR 51244 - Handle T bit -> 0x7FFFFFFF / 0x80000000

[Oleg Endo]

Hello,

This handles the case where the T bit is stored to a reg as the value
0x7FFFFFFF or 0x80000000.
Tested on rev 191894 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.
OK?

Cheers,
Oleg

gcc/ChangeLog:

	PR target/51244
	* config/sh/sh.md (*mov_t_msb_neg): New insn and two 
	accompanying unnamed split patterns.

testsuite/ChangeLog:

	PR target/51244
	* gcc.target/sh/pr51244-12.c: New.
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