LibJS: Make Function and CallFrame aware of their function name

Author: https://github.com/linusg
Commit: eece424694
Pull-request: https://github.com/SerenityOS/serenity/pull/1742

Libraries/LibJS/Runtime/NativeFunction.cpp

@@ -30,8 +30,9 @@
 
 namespace JS {
 
-NativeFunction::NativeFunction(AK::Function<Value(Interpreter&)> native_function)
-    : m_native_function(move(native_function))
+NativeFunction::NativeFunction(const FlyString& name, AK::Function<Value(Interpreter&)> native_function)
+    : m_name(name)
+    , m_native_function(move(native_function))
 {
 }