[test262] Fix number of `toString` lookups for BigInt -> String

When the ToString Torque builtin has already found and called a
`toString` or `valueOf` method on a JSReceiver, and still needs
to call the runtime afterwards, it should do so with the result
of that first step, as opposed to the original input.

Fixed: v8:11689
Change-Id: I672249f9a6c230c3e61921b043f372c25a0178cf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3097270Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76326}

src/builtins/builtins-string.tq

@@ -32,7 +32,7 @@ transitioning macro ToStringImpl(context: Context, o: JSAny): String {
         ThrowTypeError(MessageTemplate::kSymbolToString);
       }
       case (JSAny): {
-        return runtime::ToString(context, o);
+        return runtime::ToString(context, result);
       }
     }
   }

test/test262/test262.status

@@ -549,9 +549,6 @@
   # http://crbug/v8/11533
   'language/statements/class/subclass/default-constructor-spread-override': [FAIL],
 
-  # https://bugs.chromium.org/p/v8/issues/detail?id=11689
-  'built-ins/BigInt/wrapper-object-ordinary-toprimitive': [FAIL],
-
   # https://bugs.chromium.org/p/v8/issues/detail?id=11690
   'language/module-code/export-expname-binding-index': [FAIL],