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[cc2-qbe] Add basic function definition support

With this small commit we can begin to do tests, because
we can parse full functions and see what is the code generated.

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

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

@@ -130,6 +130,30 @@

 }

 static Node *

+function(void)

+{

+	Symbol *p;

+

+	/* allocate stack space for parameters */

+	for (p = locals; p && (p->type.flags & PARF) != 0; p = p->next)

+		code(ASALLOC, label2node(p), NULL, NULL);

+

+	/* allocate stack space for local variables) */

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

+		if (p->kind != SAUTO)

+			continue;

+		code(ASALLOC, label2node(p), NULL, NULL);

+	}

+	/* store formal parameters in parameters */

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

+		if ((p->type.flags & PARF) == 0)

+			break;

+		code(ASFORM, label2node(p), NULL, NULL);

+	}

+	return NULL;

+}

+

+static Node *

 rhs(Node *np, Node *new)

 {

 	Node aux;

@@ -136,6 +160,10 @@

 	Symbol *label1, *label2;

 	switch (np->op) {

+	case OBFUN:

+		return function();

+	case OEFUN:

+		return NULL;

 	case OMEM:

 	case OAUTO:

 		return load(np, new);