Added case when Object has valueOf and toString

test/built-ins/BigInt/call-value-of-when-to-string-present.js

+// Copyright (C) 2017 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: ToPrimitive receives "hint Number" as parameter, then valueOf needs to be called
+esid: sec-bigint-constructor-number-value
+info: |
+  1. If NewTarget is not undefined, throw a TypeError exception.
+  2. Let prim be ? ToPrimitive(value, hint Number).
+  ...
+features: [BigInt]
+---*/
+
+let o = {
+  valueOf: function() {
+    return 44;
+  },
+
+  toString: function() {
+    throw new Test262Error("unreachable");
+  }
+}
+
+assert.sameValue(BigInt(o), 44n);
+

test/built-ins/BigInt/value-of-throws.js

@@ -14,13 +14,13 @@ features: [BigInt]
 
 assert.throws(Test262Error, function() {
   BigInt({
-    valueOf: function() { throw new Test262Error("unreachable"); }
+    valueOf: function() { throw new Test262Error(); }
   });
 }
 
 assert.throws(Test262Error, function() {
   BigInt({
-    toString: function() { throw new Test262Error("unreachable"); }
+    toString: function() { throw new Test262Error(); }
   });
 }