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[cc2-qbe] Add support for logic negation operator

This operator is very easy because we only have
to change what is the true and what is the false.

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

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

@@ -187,6 +187,9 @@

 	Symbol *label;

 	switch (np->op) {

+	case ONEG:

+		bool(l, false, true);

+		break;

 	case OAND:

 		label = newlabel();

 		bool(l, label, true);

@@ -255,6 +258,7 @@

 	case OMEM:

 	case OAUTO:

 		return load(np, ret);

+	case ONEG:

 	case OAND:

 	case OOR:

 		true = newlabel();