extend test/ufuzz.js (#1769)

New expressions:
- property access
- array literal
- object literal

Miscellaneous:
- reduce execution timeout
- test `toplevel` and `mangleProperties`

test/ufuzz.json

@@ -4,6 +4,21 @@
             "warnings": false
         }
     },
+    {
+        "compress": {
+            "toplevel": true,
+            "warnings": false
+        },
+        "mangle": {
+            "toplevel": true
+        }
+    },
+    {
+        "compress": {
+            "warnings": false
+        },
+        "mangleProperties": {}
+    },
     {
         "compress": {
             "warnings": false
@@ -22,6 +37,23 @@
             "bracketize": true
         }
     },
+    {
+        "compress": {
+            "passes": 3,
+            "properties": false,
+            "toplevel": true,
+            "warnings": false
+        },
+        "mangle": {
+            "toplevel": true
+        },
+        "mangleProperties": {
+            "ignore_quoted": true
+        },
+        "output": {
+            "keep_quoted_props": true
+        }
+    },
     {
         "compress": {
             "keep_fargs": false,