LibJS: Move JobCallback functions out-of-line

This allows JobCallback.h to not include Runtime/AbstractOperations.h
and FunctionObject.h.

Userland/Libraries/LibJS/Runtime/JobCallback.cpp

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/AbstractOperations.h>
+#include <LibJS/Runtime/FunctionObject.h>
+#include <LibJS/Runtime/JobCallback.h>
+
+namespace JS {
+
+// 9.5.2 HostMakeJobCallback ( callback ), https://tc39.es/ecma262/#sec-hostmakejobcallback
+JobCallback make_job_callback(FunctionObject& callback)
+{
+    // 1. Return the JobCallback Record { [[Callback]]: callback, [[HostDefined]]: empty }.
+    return { make_handle(&callback) };
+}
+
+// 9.5.3 HostCallJobCallback ( jobCallback, V, argumentsList ), https://tc39.es/ecma262/#sec-hostcalljobcallback
+ThrowCompletionOr<Value> call_job_callback(VM& vm, JobCallback& job_callback, Value this_value, MarkedVector<Value> arguments_list)
+{
+    // 1. Assert: IsCallable(jobCallback.[[Callback]]) is true.
+    VERIFY(!job_callback.callback.is_null());
+
+    // 2. Return ? Call(jobCallback.[[Callback]], V, argumentsList).
+    return call(vm, job_callback.callback.cell(), this_value, move(arguments_list));
+}
+
+}