BigInt: NaN is tested in nan-throws-rangeerror.js

test/built-ins/BigInt/new-target-throws.js

@@ -14,10 +14,6 @@ assert.throws(TypeError, function() {
   new BigInt();
 });
 
-assert.throws(TypeError, function() {
-  new BigInt(NaN);
-});
-
 assert.throws(TypeError, function() {
   new BigInt({
     valueOf: function() { throw new Test262Error("unreachable"); }