js-on-sx: native prototypes inherit from Object.prototype

Per ES, every native prototype's [[Prototype]] is Object.prototype
(and Function.prototype.[[Prototype]] is too). Was missing those
links, so Object.prototype.isPrototypeOf(Boolean.prototype)
returned false (the explicit isPrototypeOf walks __proto__, not
the recent fallback). Added 5 dict-set! lines to the post-init.
built-ins/Boolean: 22/27 → 23/27, built-ins/Number: 44/50 → 45/50.
conformance.sh: 148/148.

lib/js/runtime.sx

@@ -4646,6 +4646,11 @@
   (dict-set! Array "__proto__" (get js-function-global "prototype"))
   (dict-set! Number "__proto__" (get js-function-global "prototype"))
   (dict-set! String "__proto__" (get js-function-global "prototype"))
-  (dict-set! Boolean "__proto__" (get js-function-global "prototype")))
+  (dict-set! Boolean "__proto__" (get js-function-global "prototype"))
+  (dict-set! (get Array "prototype") "__proto__" (get Object "prototype"))
+  (dict-set! (get Number "prototype") "__proto__" (get Object "prototype"))
+  (dict-set! (get String "prototype") "__proto__" (get Object "prototype"))
+  (dict-set! (get Boolean "prototype") "__proto__" (get Object "prototype"))
+  (dict-set! (get js-function-global "prototype") "__proto__" (get Object "prototype")))
 
 (define js-global {:undefined js-undefined :JSON JSON :parseInt parseInt :Object Object :isNaN js-global-is-nan :Infinity inf :NaN 0 :String String :Boolean Boolean :Array Array :Math Math :parseFloat parseFloat :Number Number :console console :isFinite js-global-is-finite})

lib/js/test262-scoreboard.json

@@ -40,6 +40,6 @@
     ]
   ],
   "pinned_commit": "d5e73fc8d2c663554fb72e2380a8c2bc1a318a33",
-  "elapsed_seconds": 32.3,
+  "elapsed_seconds": 38.2,
   "workers": 1
 }

lib/js/test262-scoreboard.md

@@ -1,7 +1,7 @@
 # test262 scoreboard
 
 Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
-Wall time: 32.3s
+Wall time: 38.2s
 
 **Total:** 44/50 runnable passed (88.0%). Raw: pass=44 fail=6 skip=0 timeout=0 total=50.