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[cc2] Remove input dependecy from assign()

This function had a dependency with the input language in how it
was parsing the subop value.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -232,29 +232,30 @@

 static void

 assign(char *token, union tokenop u)

 {

-	int c, op = *token++;

+	int subop, op = u.op;

 	Node *np = newnode();

-	switch (*token) {

-	case ODIV:

-	case OMOD:

-	case OADD:

-	case OSUB:

-	case OSHL:

-	case OSHR:

-	case OBAND:

-	case OBXOR:

-	case OBOR:

-	case OINC:

-	case ODEC:

-		c = *token++;

+	switch (subop = *++token) {

+	case '/':

+	case '%':

+	case '+':

+	case '-':

+	case 'l':

+	case 'r':

+	case '&':

+	case '|':

+	case '^':

+	case 'i':

+	case 'd':

+		++token;

+		subop = optbl[subop].u.op;

 		break;

 	default:

-		c = 0;

+		subop = 0;

 		break;

 	}

-	np->u.subop = c;

+	np->u.subop = subop;

 	np->op = op;

 	np->type = *gettype(token);

 	np->right = pop();