compress new function containing this (#2417)

test/compress/properties.js

@@ -1006,3 +1006,22 @@ array_hole: {
     }
     expect_stdout: "2 undefined 3"
 }
+
+new_this: {
+    options = {
+        properties: true,
+        side_effects: true,
+    }
+    input: {
+        new {
+            f: function(a) {
+                this.a = a;
+            }
+        }.f(42);
+    }
+    expect: {
+        new function(a) {
+            this.a = a;
+        }(42);
+    }
+}