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[cc2] Break dependency between O and S codes

Until now, codes like OAUTO were forced to be equal to codes like SAUTO.
This commit break this dependency.

--- a/cc2/code.c

+++ b/cc2/code.c

@@ -29,16 +29,25 @@

 static void

 addr(Node *np, Addr *addr)

 {

-	switch (addr->kind = np->op) {

-	case SREG:

+	switch (np->op) {

+	case OREG:

+		addr->kind = SREG;

 		addr->u.reg = np->u.reg;

 		break;

-	case SCONST:

+	case OCONST:

+		addr->kind = OCONST;

 		addr->u.i = np->u.i;

 		break;

-	case SLABEL:

-	case SAUTO:

-	case STMP:

+	case OJMP:

+	case OLABEL:

+		addr->kind = SLABEL;

+		goto symbol;

+	case OAUTO:

+		addr->kind = SAUTO;

+		goto symbol;

+	case OTMP:

+		addr->kind = STMP;;

+	symbol:

 		addr->u.sym = np->u.sym;

 		break;

 	default: