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Allow assignment of not register things

assign() was limited to register nodes, but this change
make possible to use another kind of nodes.

--- a/cc2/cgen.c

+++ b/cc2/cgen.c

@@ -81,6 +81,7 @@

 	}

 };

+/* TODO: Remove reg8 and reg16 arrays */

 static uint8_t

 allocreg(uint8_t size)

 {

@@ -245,6 +246,9 @@

 {

 	assert(np->type.size == 1);

 	switch (parent->op) {

+	case OASSIG:

+		moveto(np, allocreg(1));

+		break;

 	case OADD:

 	case OSUB:

 		switch (np->op) {

@@ -317,7 +321,6 @@

 	Node *lp = np->left, *rp = np->right;

 	Symbol *sym = lp->sym;

-	assert(rp->op == REG);

 	switch (np->type.size) {

 	case 1:

 		switch (lp->op) {

@@ -324,8 +327,11 @@

 		case MEM:

 			if (sym && sym->index)

 				lp->op = INDEX;

+			/* PASSTROUGH */

 		case INDEX:

 		case AUTO:

+			if (rp->op != REG)

+				move(rp, np);

 			code(LDL, lp, rp);

 			break;

 		case REG: