Track heap objects.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index f08c56e1f79856a4e445eb60fb1a072e1b3785b4..b35790297570b20f830c5c523734358c4fff520b 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -3921,6 +3921,19 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
       Register value = ToRegister(instr->value());
       __ Integer32ToSmi(value, value);
     }
+  } else if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
+    if (instr->value()->IsConstantOperand()) {
+      LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
+      if (IsInteger32Constant(operand_value)) {
+        DeoptimizeIf(no_condition, instr->environment());
+      }
+    } else {
+      if (!instr->hydrogen()->value()->type().IsHeapObject()) {
+        Register value = ToRegister(instr->value());
+        Condition cc = masm()->CheckSmi(value);
+        DeoptimizeIf(cc, instr->environment());
+      }
+    }
   } else if (FLAG_track_double_fields && representation.IsDouble()) {
     ASSERT(transition.is_null());
     ASSERT(instr->is_in_object());