Implement IC support for Constant Function transitions.

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index 095b61498623e01b0c6d48c1f0bc8ee6e7343733..77e01967f6a80fe405c3a12f7043d2da88b66d88 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -1733,7 +1733,7 @@ Handle<Code> StoreIC::ComputeStoreMonomorphic(LookupResult* lookup,
       DescriptorArray* target_descriptors = transition->instance_descriptors();
       PropertyDetails details = target_descriptors->GetDetails(descriptor);
 
-      if (details.type() != FIELD || details.attributes() != NONE) break;
+      if (details.type() == CALLBACKS || details.attributes() != NONE) break;
 
       return isolate()->stub_cache()->ComputeStoreTransition(
           name, receiver, lookup, transition, strict_mode);
@@ -2099,7 +2099,7 @@ Handle<Code> KeyedStoreIC::ComputeStoreMonomorphic(LookupResult* lookup,
       DescriptorArray* target_descriptors = transition->instance_descriptors();
       PropertyDetails details = target_descriptors->GetDetails(descriptor);
 
-      if (details.type() == FIELD && details.attributes() == NONE) {
+      if (details.type() != CALLBACKS && details.attributes() == NONE) {
         return isolate()->stub_cache()->ComputeKeyedStoreTransition(
             name, receiver, lookup, transition, strict_mode);
       }