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[cc2/z80] Add code for bool()

This code is identical is almos identical in any architecture,
only the branch macro changes. More changes to this function
are expected in the future.

--- a/cc2/target/z80-scc/arch.h

+++ b/cc2/target/z80-scc/arch.h

@@ -1,4 +1,5 @@

 enum asmop {

 	ASJMP = 0,

 	ASRET,

+	ASBRANCH,

 };

--- a/cc2/target/z80-scc/cgen.c

+++ b/cc2/target/z80-scc/cgen.c

@@ -22,6 +22,32 @@

 static void

 bool(Node *np, Symbol *true, Symbol *false)

 {

+	Node *l = np->left, *r = np->right;

+	Node ret, ifyes, ifno;

+	Symbol *label;

+

+	switch (np->op) {

+	case ONEG:

+		bool(l, false, true);

+		break;

+	case OAND:

+		label = newlabel();

+		bool(l, label, false);

+		setlabel(label);

+		bool(r, true, false);

+		break;

+	case OOR:

+		label = newlabel();

+		bool(l, true, label);

+		setlabel(label);

+		bool(r, true, false);

+		break;

+	default:

+		label2node(&ifyes, true);

+		label2node(&ifno, false);

+		code(ASBRANCH, rhs(np, &ret), &ifyes, &ifno);

+		break;

+	}

 }

 Node *