Modify NONZERO irgen to allow patchpointing

src/codegen/ast_interpreter.cpp

@@ -748,7 +748,7 @@ Value ASTInterpreter::visit_assert(AST_Assert* node) {
 #ifndef NDEBUG
     // Currently we only generate "assert 0" statements
     Value v = visit_expr(node->test);
-    assert(v.n == 0);
+    assert(v.o->cls == int_cls && static_cast<BoxedInt*>(v.o)->n == 0);
 #endif
     assertFail(source_info->parent_module, node->msg ? visit_expr(node->msg).o : 0);
 

src/codegen/irgen/irgenerator.cpp

@@ -547,10 +547,9 @@ private:
                 assert(node->args.size() == 1);
                 CompilerVariable* obj = evalExpr(node->args[0], unw_info);
 
-                ConcreteCompilerVariable* converted_obj = obj->makeConverted(emitter, obj->getBoxType());
-                obj->decvref(emitter);
-
-                llvm::Value* v = emitter.createCall(unw_info, g.funcs.nonzero, { converted_obj->getValue() });
+                ConcreteCompilerVariable* rtn = obj->nonzero(emitter, getOpInfoForNode(node, unw_info));
+                assert(rtn->getType() == BOOL);
+                llvm::Value* v = i1FromBool(emitter, rtn);
                 assert(v->getType() == g.i1);
 
                 return boolFromI1(emitter, v);