[es6] Fix missing bits for full @@toPrimitive support.

src/runtime/runtime-numbers.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
+#include "src/isolate-inl.h"
 
 namespace v8 {
 namespace internal {
 
 RUNTIME_FUNCTION(Runtime_NumberToRadixString) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_SMI_ARG_CHECKED(radix, 1);
   RUNTIME_ASSERT(2 <= radix && radix <= 36);
 
@@ skipping 143 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_NumberToStringSkipCache) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(number, 0);
 
   return *isolate->factory()->NumberToString(number, false);
 }
 
 
+// TODO(bmeurer): Kill this runtime entry. Uses in date.js are wrong anyway.
 RUNTIME_FUNCTION(Runtime_NumberToIntegerMapMinusZero) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
-
-  CONVERT_DOUBLE_ARG_CHECKED(number, 0);
-  double double_value = DoubleToInteger(number);
+  CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, input, Object::ToNumber(input));
+  double double_value = DoubleToInteger(input->Number());
   // Map both -0 and +0 to +0.
   if (double_value == 0) double_value = 0;
 
   return *isolate->factory()->NewNumber(double_value);
 }
 
 
 // Converts a Number to a Smi, if possible. Returns NaN if the number is not
 // a small integer.
 RUNTIME_FUNCTION(Runtime_NumberToSmi) {
@@ skipping 119 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_GetRootNaN) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   return isolate->heap()->nan_value();
 }
 
 }  // namespace internal
 }  // namespace v8