[JS IR] Drop TemporaryAssignmentElimination optimization

Enable TemporaryAssignment tests

js/js.translator/testData/js-optimizer/temporary-assignment/transitiveAssignment.optimized.js

@@ -1,10 +1,12 @@
 function test(param) {
+    var $a;
     var result;
     if (param > 0) {
-        result = param;
+        $a = param;
     } else {
-        result = -param;
+        $a = -param;
     }
+    result = $a;
     return result;
 }
 
@@ -16,4 +18,4 @@ function box() {
     if (result != 20) return "fail2: " + result;
 
     return "OK"
-}
+}