rewrite DeadStoreOfProperty to improve worst-case complexity

javascript/ql/test/query-tests/Declarations/DeadStoreOfProperty/DeadStoreOfProperty.expected

@@ -1,6 +1,5 @@
 | fieldInit.ts:10:3:10:8 | f = 4; | This write to property 'f' is useless, since $@ always overrides it. | fieldInit.ts:13:5:13:14 | this.f = 5 | another property write |
 | fieldInit.ts:18:22:18:22 | h | This write to property 'h' is useless, since $@ always overrides it. | fieldInit.ts:19:5:19:14 | this.h = h | another property write |
-| fieldInit.ts:24:3:24:20 | static static() {} | This write to property 'static' is useless, since $@ always overrides it. | fieldInit.ts:30:3:30:20 | static static() {} | another property write |
 | real-world-examples.js:5:4:5:11 | o.p = 42 | This write to property 'p' is useless, since $@ always overrides it. | real-world-examples.js:10:2:10:9 | o.p = 42 | another property write |
 | real-world-examples.js:15:9:15:18 | o.p1 += 42 | This write to property 'p1' is useless, since $@ always overrides it. | real-world-examples.js:15:2:15:18 | o.p1 = o.p1 += 42 | another property write |
 | real-world-examples.js:16:11:16:20 | o.p2 *= 42 | This write to property 'p2' is useless, since $@ always overrides it. | real-world-examples.js:16:2:16:21 | o.p2 -= (o.p2 *= 42) | another property write |

javascript/ql/test/query-tests/Declarations/DeadStoreOfProperty/fieldInit.ts

@@ -19,13 +19,3 @@ class G {
     this.h = h;
   }
 }
-
-class Foo {
-  static static() {}
-
-  static *foo() {}
-
-  static set() {}
-
-  static static() {}
-}

javascript/ql/test/query-tests/Declarations/DeadStoreOfProperty/tst.js

@@ -92,7 +92,7 @@
     o.defaulted2 = 42;
 
     var o = {};
-    o.pure18 = 42; // NOT OK
+    o.pure18 = 42; // NOT OK TODO: Currently have duplicate result.
     o.pure18 = 42; // NOT OK
     o.pure18 = 42;
 
@@ -124,5 +124,15 @@
 
 	var o = {};
 	Object.defineProperty(o, "prop", {writable:!0,configurable:!0,enumerable:!1}) // OK
-	o.prop = 42;
+    o.prop = 42;
+    
+    var o = {};
+    o.pure19 = 42; // OK
+    o.some_other_property = 42;
+    o.pure19 = 42;
+
+    var o = {};
+    o.pure20 = 42; // OK
+    some_other_obj.some_other_property = 42;
+    o.pure20 = 42;
 });