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[cc2-qbe] Load parameters before calling functions

We were not loading the parameters, so it mean
that we were always passing pointers to the
parameters that were symbols.

--- a/cc2/arch/qbe/cgen.c

+++ b/cc2/arch/qbe/cgen.c

@@ -239,8 +239,10 @@

 	Type *tp = &np->type;

 	Node **q, *tmp, *p, *pars[NR_FUNPARAM];

-	for (n = 0, p = np->right; p; p = p->right)

-		pars[n++] = cgen(p->left);

+	for (n = 0, p = np->right; p; p = p->right) {

+		cgen(p->left);

+		pars[n++] = load(p, LOADL);

+	}

 	switch (tp->size) {

 	case 0: