Add HeapNumber fast path to v8::Value::{Uint,Int}32Value()

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index d1e782f7d35af10bfb47e28b6e3f060449cbe06d..19b877823c339f24fc06fd59093d1007cff8f6a6 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -2829,8 +2829,8 @@ Local<Uint32> Value::ToArrayIndex() const {
 
 int32_t Value::Int32Value() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
-  if (obj->IsSmi()) {
-    return i::Smi::cast(*obj)->value();
+  if (obj->IsNumber()) {
+    return NumberToInt32(*obj);
   } else {
     i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
     LOG_API(isolate, "Int32Value (slow)");
@@ -2930,8 +2930,8 @@ bool Value::SameValue(Handle<Value> that) const {
 
 uint32_t Value::Uint32Value() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
-  if (obj->IsSmi()) {
-    return i::Smi::cast(*obj)->value();
+  if (obj->IsNumber()) {
+    return NumberToUint32(*obj);
   } else {
     i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
     LOG_API(isolate, "Uint32Value");