Remove regression test from jsc, covered by new tests

implementation-contributed/javascriptcore/stress/regress-189292.js

-//@ runDefault
-
-function assert(a, b) {
-    if (a != b)
-        throw "FAIL";
-}
-
-function test(script) {
-    try {
-        eval(script);
-    } catch (e) {
-        return e;
-    }
-}
-
-assert(test("class C1 { async constructor() { } }"), "SyntaxError: Cannot declare an async method named 'constructor'.");
-assert(test("class C1 { *constructor() { } }"), "SyntaxError: Cannot declare a generator function named 'constructor'.");
-assert(test("class C1 { async *constructor() { } }"), "SyntaxError: Cannot declare an async generator method named 'constructor'.");