Wrong output when case clause is a conditional expression

Executing following code :
---------------------------------------------
(function()
{
    var f = 0;
    switch (f)
    {
        case ((f = 1)? 0 : 0):
            print("pass");
            break;
        default:
            print(f);
            print("fail");
            break;
    };
})();

print("BT_FLAG");
----------------------------------------------

Output should be :
pass
BT_FLAG

However, output of JavaScriptCore is :
1
fail
BT_FLAG



BT_GROUP
2018/8/21

[Alexey Shvayka]

(In reply to sunlili from comment #0)
> Output should be :
> pass
> BT_FLAG

As of r262695, JSC is correct.
Test: https://trac.webkit.org/browser/webkit/trunk/JSTests/ChakraCore/test/Basics/switch.js?rev=262695#L55.

[Radar WebKit Bug Importer]

<rdar://problem/64089530>