Avoid HeapObject check in HStoreNamedField.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 3ebceea66a4539296d626c98d3f8b9f48e2a8bac..7e587c1d457c88b2e5cd41adf12fe1246abcea6d 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -2394,16 +2394,7 @@ LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
   // We need a temporary register for write barrier of the map field.
   LOperand* temp_map = needs_write_barrier_for_map ? TempRegister() : NULL;
 
-  LInstruction* result =
-      new(zone()) LStoreNamedField(obj, val, temp, temp_map);
-  if (!instr->access().IsExternalMemory() &&
-      instr->field_representation().IsHeapObject() &&
-      (val->IsConstantOperand()
-       ? HConstant::cast(instr->value())->HasSmiValue()
-       : !instr->value()->type().IsHeapObject())) {
-    result = AssignEnvironment(result);
-  }
-  return result;
+  return new(zone()) LStoreNamedField(obj, val, temp, temp_map);
 }