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Do not fold expressions with static addresses

Static addresses are constant values, but he don't know
the value of them in the frontend, so they cannot be folded

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -17,7 +17,7 @@

 	Type *tp;

 	TUINT mask, nodeval;

-	if (!np || !np->constant)

+	if (!np || !np->constant || !np->sym)

 		return 0;

 	sym = np->sym;

 	tp = sym->type;

--- a/cc1/fold.c

+++ b/cc1/fold.c

@@ -316,8 +316,17 @@

 		warn("division by 0");

 		return NULL;

 	}

-	if (!lp->constant || rp && !rp->constant)

+	/*

+	 * Return if any of the children is no constant,

+	 * or it is a constant generated when

+	 * the address of a static variable is taken

+	 * (when we don't know the physical address so

+	 * we cannot fold it)

+	 */

+	if (!lp->constant || !lp->sym ||

+	    rp && (!rp->constant || !rp->sym)) {

 		return NULL;

+	}

 	optype = lp->type;

 	ls = lp->sym;

 	rs = (rp) ? rp->sym : NULL;