[JSC] Fix Map.groupBy and Object.groupBy callback arguments

https://bugs.webkit.org/show_bug.cgi?id=263308
rdar://117120234

Reviewed by Alexey Shvayka.

This patch adjusts Map.groupBy / Object.groupBy's callback arguments to the latest proposal[1].

[1]: https://github.com/tc39/proposal-array-grouping

* JSTests/test262/expectations.yaml:
* Source/JavaScriptCore/builtins/MapConstructor.js:
(groupBy):
* Source/JavaScriptCore/builtins/ObjectConstructor.js:
(groupBy):

Canonical link: https://commits.webkit.org/269456@main

Author: Constellation

JSTests/test262/expectations.yaml

@@ -175,15 +175,9 @@ test/built-ins/Function/internals/Construct/derived-this-uninitialized-realm.js:
 test/built-ins/Function/prototype/toString/built-in-function-object.js:
   default: 'Test262Error: Conforms to NativeFunction Syntax: "function $*() {\n    [native code]\n}" (%RegExp%.$*)'
   strict mode: 'Test262Error: Conforms to NativeFunction Syntax: "function $*() {\n    [native code]\n}" (%RegExp%.$*)'
-test/built-ins/Map/groupBy/callback-arg.js:
-  default: 'Test262Error: only two arguments are passed Expected SameValue(«3», «2») to be true'
-  strict mode: 'Test262Error: only two arguments are passed Expected SameValue(«3», «2») to be true'
 test/built-ins/Object/entries/order-after-define-property-with-function.js:
   default: 'Test262Error: Expected [a, name] and [name, a] to have the same contents. '
   strict mode: 'Test262Error: Expected [a, name] and [name, a] to have the same contents. '
-test/built-ins/Object/groupBy/callback-arg.js:
-  default: 'Test262Error: only two arguments are passed Expected SameValue(«3», «2») to be true'
-  strict mode: 'Test262Error: only two arguments are passed Expected SameValue(«3», «2») to be true'
 test/built-ins/Object/keys/order-after-define-property-with-function.js:
   default: 'Test262Error: Expected [a, length] and [length, a] to have the same contents. '
   strict mode: 'Test262Error: Expected [a, length] and [length, a] to have the same contents. '

Source/JavaScriptCore/builtins/MapConstructor.js

@@ -36,7 +36,7 @@ function groupBy(items, callback)
     var groups = new @Map;
     var k = 0;
     for (var item of items) {
-        var key = callback.@call(@undefined, item, k, items);
+        var key = callback.@call(@undefined, item, k);
         var group = groups.@get(key);
         if (!group) {
             group = [];

Source/JavaScriptCore/builtins/ObjectConstructor.js

@@ -56,7 +56,7 @@ function groupBy(items, callback)
     var groups = @Object.@create(null);
     var k = 0;
     for (var item of items) {
-        var key = @toPropertyKey(callback.@call(@undefined, item, k, items));
+        var key = @toPropertyKey(callback.@call(@undefined, item, k));
         var group = groups[key];
         if (!group) {
             group = [];