Add passing test for {return:} resumption from a generator frame.

js/src/jit-test/tests/debug/resumption-04.js

@@ -0,0 +1,15 @@
+// |jit-test| debug
+// Forced return from a generator frame.
+
+var g = newGlobal('new-compartment');
+g.debuggeeGlobal = this;
+g.eval("var dbg = new Debug(debuggeeGlobal);" +
+       "dbg.hooks = {debuggerHandler: function () { return {return: '!'}; }};");
+
+function gen() {
+    yield '1';
+    debugger;  // Force return here. The value is ignored.
+    yield '2';
+}
+var x = [v for (v in gen())];
+assertEq(x.join(","), "1");