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Sign extend byte regs for signed division.

--- a/6/isel.c

+++ b/6/isel.c

@@ -534,7 +534,7 @@

             g(s, Imov, a, c, NULL);

             if (istysigned(exprtype(args[0]))) {

                 switch (r->mode) {

-                    case ModeB: break;

+                    case ModeB: g(s, Imovsx, c, coreg(Rrax, ModeW), NULL); break;

                     case ModeW: g(s, Icwd, NULL);       break;

                     case ModeL: g(s, Icdq, NULL);       break;

                     case ModeQ: g(s, Icqo, NULL);       break;