Bug 765454 - Add forgotten test case. (r=jandem)

js/src/jit-test/tests/ion/bug765454.js

@@ -0,0 +1,28 @@
+var bailout = Proxy.createFunction({}, Math.sin);
+
+var seen = -1;
+
+// Test to make sure the jits get the number of calls, and return value
+// of setters correct. We should not be affected by whether the setter
+// modifies its argument or returns some value.
+function setter(x) {
+    this.val = x;
+    x = 255;
+    bailout();
+    seen++;
+    assertEq(seen, this.val);
+    return 5;
+}
+
+function F(){}
+Object.defineProperty(F.prototype, "value" , ({set: setter}));
+
+function test() {
+    var obj = new F();
+    var itrCount = 10000;
+    for(var i = 0; i < itrCount; i++) {
+        assertEq(obj.value = i, i);
+        assertEq(obj.val, i);
+    }
+}
+test();