lib: make safe primordials safe to construct

lib/internal/per_context/primordials.js

@@ -84,21 +84,31 @@ primordials.makeSafe = makeSafe;
 
 // Subclass the constructors because we need to use their prototype
 // methods later.
+// Defining the `constructor` is necessary here to avoid the default
+// constructor which uses the user-mutable `%ArrayIteratorPrototype%.next`.
 primordials.SafeMap = makeSafe(
   Map,
-  class SafeMap extends Map {}
+  class SafeMap extends Map {
+    constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
+  }
 );
 primordials.SafeWeakMap = makeSafe(
   WeakMap,
-  class SafeWeakMap extends WeakMap {}
+  class SafeWeakMap extends WeakMap {
+    constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
+  }
 );
 primordials.SafeSet = makeSafe(
   Set,
-  class SafeSet extends Set {}
+  class SafeSet extends Set {
+    constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
+  }
 );
 primordials.SafeWeakSet = makeSafe(
   WeakSet,
-  class SafeWeakSet extends WeakSet {}
+  class SafeWeakSet extends WeakSet {
+    constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
+  }
 );
 
 // Create copies of the namespace objects