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Don't die on zero sized structs.

--- a/6/isel.c

+++ b/6/isel.c

@@ -409,6 +409,8 @@

 	Loc *tmp, *src, *dst; /* source memory, dst memory */

 	assert(szmodes[align] != ModeNone);   /* make sure we have a valid alignment */

+	if (!sz)

+		return;

 	sp = inr(s, from);

 	dp = inr(s, to);

--- a/6/typeinfo.c

+++ b/6/typeinfo.c

@@ -329,7 +329,7 @@

 			align = max(align, tyalign(decltype(ty->sdecls[i])));

 		break;

 	default:

-		align = tysize(ty);

+		align = max(align, tysize(ty));

 	}

 	return min(align, Ptrsz);

 }