[SH] PR 51244 - Fix defects introduced in 4.8

[Kaz Kojima]

Oleg Endo <oleg.endo@t-online.de> wrote:
> Forgot to handle a case in function can_remove_cstore, thanks for
> catching it.  Fixed in the attached patch and also added test cases.
> Retested as before without new failures.

Ok for trunk.

> Yeah, right.  I've changed 'ifcvt_sh' to 'sh_ifcvt'.

>+  register_pass (make_pass_sh_ifcvt (g, false, "ifcvt1_sh"),
>+		 PASS_POS_INSERT_AFTER, "ce1", 1);
>+*/

s/ifcvt1_sh/sh_ifcvt1/ might be better even in a comment.

Regards,
	kaz