[SH] PR 51244 - Add combiner patterns for branch inversion

[Oleg Endo]

Hello,

This adds some patters that allow the combine pass to catch inverted
compare and branch opportunities better.

Tested on rev 190273 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?

PS: I'm still puzzled why combine sometimes takes different 'routes' on
SH4A and/or SH2A which requires extra patterns to handle some cases ... 

Cheers,
Oleg

ChangeLog:

	PR target/51244
	* config/sh/sh.md: Add splits for inverted compare and branch 
	opportunities.
	(*cmpeqsi_t): New insn.
	(cmpgtsi_t, cmpgesi_t): Swap r and N alternatives.
	(cmpgeusi_t): Use satisfies_constraint_Z.  Emit sett insn in 
	replacement insn list and not in the preparation statements.
	(clrt, sett): Add mt_group attribute.

testsuite/ChangeLog:

	PR target/51244
	* gcc.target/sh/pr51244-7.c: New.
	* gcc.target/sh/pr51244-8.c: New.
	* gcc.target/sh/pr51244-9.c: New.
	* gcc.target/sh/pr51244-10.c: New.
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