if goos == "darwin" || ((goos == "linux" || goos == "windows") && goarch == "amd64") {
		t.registerTest("API release note check", &goTest{variant: "check", pkg: "cmd/relnote", testFlags: []string{"-check"}})
		t.registerTest("API check", &goTest{variant: "check", pkg: "cmd/api", timeout: 5 * time.Minute, testFlags: []string{"-check"}})
	}

	// Runtime CPU tests.

// gcBgMarkWorker goroutine.
type gcBgMarkWorkerNode struct {
	// Unused workers are managed in a lock-free stack. This field must be first.
	node lfnode

	// The g of this worker.
	gp guintptr

	// Release this m on park. This is used to communicate with the unlock
	// function, which cannot access the G's stack. It is unused outside of