VM: Remove unnecessary _Num class from runtime/lib.

runtime/lib/double.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bootstrap_natives.h"
 
 #include "platform/math.h"
 
 #include "vm/code_generator.h"  // DartModulo.
 #include "vm/dart_entry.h"
@@ skipping 212 matching lines @@
   if (0 <= start && start < end && end <= len) {
     double double_value;
     if (String::ParseDouble(value, start, end, &double_value)) {
       return Double::New(double_value);
     }
   }
   return Object::null();
 }
 
 
+DEFINE_NATIVE_ENTRY(Double_toString, 1) {
+  const Number& number = Number::CheckedHandle(arguments->NativeArgAt(0));
+  Heap::Space space = isolate->heap()->ShouldPretenure(kOneByteStringCid) ?
+      Heap::kPretenured : Heap::kNew;
+  return number.ToString(space);
+}
+
+
 DEFINE_NATIVE_ENTRY(Double_toStringAsFixed, 2) {
   // The boundaries are exclusive.
   static const double kLowerBoundary = -1e21;
   static const double kUpperBoundary = 1e21;
 
   const Double& arg = Double::CheckedHandle(arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(Smi, fraction_digits, arguments->NativeArgAt(1));
   double d = arg.value();
   intptr_t fraction_digits_value = fraction_digits.Value();
   if (0 <= fraction_digits_value && fraction_digits_value <= 20
@@ skipping 61 matching lines @@
 DEFINE_NATIVE_ENTRY(Double_flipSignBit, 1) {
   const Double& arg = Double::CheckedHandle(arguments->NativeArgAt(0));
   const double in_val = arg.value();
   const int64_t bits = bit_cast<int64_t, double>(in_val) ^ kSignBitDouble;
   return Double::New(bit_cast<double, int64_t>(bits));
 }
 
 // Add here only functions using/referring to old-style casts.
 
 }  // namespace dart