LibJS: Don't add uncaptured parameter bindings to environment

For parameters that exist strictly as "locals", we can save time and
space by not adding them to the function environment.

This is a speed-up across the board on basically every test.
For example, ~11% on Octane/typescript.js :^)

Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.h

@@ -153,7 +153,11 @@ private:
 
     bool m_has_parameter_expressions { false };
     bool m_has_duplicates { false };
-    HashTable<DeprecatedFlyString> m_parameter_names;
+    enum class ParameterIsLocal {
+        No,
+        Yes,
+    };
+    HashMap<DeprecatedFlyString, ParameterIsLocal> m_parameter_names;
     Vector<FunctionDeclaration const&> m_functions_to_initialize;
     bool m_arguments_object_needed { false };
     bool m_is_module_wrapper { false };