Split yet more runtime functions into separate files.

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/v8.h"
 
 #include "src/arguments.h"
 #include "src/codegen.h"
 #include "src/misc-intrinsics.h"
 #include "src/runtime/runtime.h"
@@ skipping 543 matching lines @@
   if (x_scaled < y_scaled) return Smi::FromInt(LESS);
   if (x_scaled > y_scaled) return Smi::FromInt(GREATER);
   return Smi::FromInt(tie);
 }
 
 
 RUNTIME_FUNCTION(RuntimeReference_NumberToString) {
   SealHandleScope shs(isolate);
   return __RT_impl_Runtime_NumberToStringRT(args, isolate);
 }
+
+
+RUNTIME_FUNCTION(RuntimeReference_IsSmi) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsSmi());
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_IsNonNegativeSmi) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsSmi() &&
+                                    Smi::cast(obj)->value() >= 0);
+}
 }
 }  // namespace v8::internal