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[cc2-qbe] Allocate stack space only for automatic variables

We have different local variables, but we only have to allocate
space for automatic variables.

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

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

@@ -330,7 +330,7 @@

 	/* allocate stack space for local variables) */

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

-		if (p->kind && p->kind != SLABEL)

+		if (p->kind == SAUTO)

 			alloc(p);

 	}

 	/* store formal parameters in parameters */