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[cc2-qbe] Do not allocate space for labels

Labels are locals and they are not temporaries, so we need a specific
check for them

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

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

@@ -317,9 +317,10 @@

 		alloc(p);

 	/* allocate stack space for local variables) */

-	for ( ; p && p->id != TMPSYM; p = p->next)

-		alloc(p);

-

+	for ( ; p && p->id != TMPSYM; p = p->next) {

+		if (p->kind != SLABEL)

+			alloc(p);

+	}

 	/* store formal parameters in parameters */

 	for (p = locals; p; p = p->next) {

 		tp = &p->type;