[SH][committed] Add some more missing div0s cases

[Oleg Endo]

Hi,

The attached patch addresses some of the remaining things as mentioned
in the PR.

Tested on sh-elf with

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

Committed as r235952.

Cheers,
Oleg

gcc/ChangeLog:
	PR target/52933
	* config/sh/sh.md (*cmp_div0s_7, *cmp_div0s_8): Add div0s variants.
	* config/sh/sh.c (sh_rtx_costs): Add another div0s case.

gcc/testsuite/ChangeLog:
	PR target/52933
	* gcc.target/sh/pr52933-1.c (test_31, test_32, test_33, test_34,
	test_35, test_36, test_37, test_38, test_39, test_40): New sub-tests.
	Adjust expected instruction counts.
	* gcc.target/sh/pr52933-2.c: Adjust expected instruction counts.
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