Introduce v8::Integer::NewFromUnsigned method.

include/v8.h

Index: include/v8.h
===================================================================
--- include/v8.h	(revision 3030)
+++ include/v8.h	(working copy)
@@ -1063,6 +1063,7 @@
 class V8EXPORT Integer : public Number {
  public:
   static Local<Integer> New(int32_t value);
+  static inline Local<Integer> NewFromUnsigned(uint32_t value);
   int64_t Value() const;
   static inline Integer* Cast(v8::Value* obj);
  private:
@@ -3025,6 +3026,16 @@
 }
 
 
+Local<Integer> Integer::NewFromUnsigned(uint32_t value) {
+  // If highest bit is not set, chances are it's SMI.
+  bool fits_into_int32_t = (value & (1 << 31)) == 0;
+  if (fits_into_int32_t) {
+    return Integer::New(static_cast<int32_t>(value));
+  }
+  return Local<Integer>::Cast(Number::New(value));
+}
+
+
 Integer* Integer::Cast(v8::Value* value) {
 #ifdef V8_ENABLE_CHECKS
   CheckCast(value);