Implement IC support for Constant Function transitions.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 93923a70349b69e339fdac2c980703f09310b9ca..51c3692e432bfb779d8e63b4e001efe1b4b9847d 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -839,8 +839,14 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
 
   Register storage_reg = name_reg;
 
-  if (FLAG_track_fields && representation.IsSmi()) {
-    __ JumpIfNotSmi(value_reg, miss_restore_name);
+  if (details.type() == CONSTANT_FUNCTION) {
+    Handle<HeapObject> constant(
+        HeapObject::cast(descriptors->GetValue(descriptor)));
+    __ LoadHeapObject(scratch1, constant);
+    __ cmp(value_reg, scratch1);
+    __ j(not_equal, miss_restore_name);
+  } else if (FLAG_track_fields && representation.IsSmi()) {
+      __ JumpIfNotSmi(value_reg, miss_restore_name);
   } else if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
     __ JumpIfSmi(value_reg, miss_restore_name);
   } else if (FLAG_track_double_fields && representation.IsDouble()) {
@@ -913,6 +919,8 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
                       OMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
 
+  if (details.type() == CONSTANT_FUNCTION) return;
+
   int index = transition->instance_descriptors()->GetFieldIndex(
       transition->LastAdded());