Bug 220506

#version: dbae081(https://github.com/WebKit/WebKit-http/commit/dbae081ad7e22d9ab61edf2f337f6c2bb593c7f8)

#Testcase:
for ([a,b] = [1,2] of [[3,4]]) {};
print(a);
print(b);

#Command:
./webkit/WebKitBuild/Release/bin/jsc testcase.js

#Output:
3
4

#Expected output:
SyntaxError: invalid for in/of left hand-side

#Description:
When executing this test case, other engines throw errors (such as v8, SpiderMonkey, chakra, etc.), but JSC executes normally and outputs 3 and 4. So I suspect this is a bug in javaScriptCore.