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Use the value of constant expressions in array sizes

At this point we can reduce addition operators, so we can take
the value of the constant expression and use it for the size
of the array.

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -39,15 +39,20 @@

 static struct dcldata *

 arydcl(struct dcldata *dp)

 {

-	Node *np = NULL;

+	Node *np;

+	TINT n;

 	expect('[');

 	np = (yytoken != ']') ? constexpr() : NULL;

 	expect(']');

+

 	/*

-	 * TODO: Evaluate np.

+	 * TODO: check that the type of the constant expression

+	 * is the correct, that in this case should be int

 	 */

-	return queue(dp, ARY, 0, NULL);

+	n = (np == NULL) ? 0 : np->sym->u.i;

+

+	return queue(dp, ARY, n, NULL);

 }

 static Symbol *parameter(void);