[turbofan] Restore basic write barrier elimination.

src/compiler/simplified-operator.cc

Index: src/compiler/simplified-operator.cc
diff --git a/src/compiler/simplified-operator.cc b/src/compiler/simplified-operator.cc
index f383ace587470e46ea00dd5055bfdc1c55e0e196..b3ce41cf885c04c352a0904fd8d05937ec88570b 100644
--- a/src/compiler/simplified-operator.cc
+++ b/src/compiler/simplified-operator.cc
@@ -13,6 +13,10 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
+size_t hash_value(BaseTaggedness base_taggedness) {
+  return static_cast<uint8_t>(base_taggedness);
+}
+
 std::ostream& operator<<(std::ostream& os, BaseTaggedness base_taggedness) {
   switch (base_taggedness) {
     case kUntaggedBase:
@@ -110,7 +114,7 @@ std::ostream& operator<<(std::ostream& os, FieldAccess const& access) {
   }
 #endif
   access.type->PrintTo(os);
-  os << ", " << access.machine_type << "]";
+  os << ", " << access.machine_type << ", " << access.write_barrier_kind << "]";
   return os;
 }
 
@@ -136,7 +140,7 @@ size_t hash_value(ElementAccess const& access) {
 std::ostream& operator<<(std::ostream& os, ElementAccess const& access) {
   os << access.base_is_tagged << ", " << access.header_size << ", ";
   access.type->PrintTo(os);
-  os << ", " << access.machine_type;
+  os << ", " << access.machine_type << ", " << access.write_barrier_kind;
   return os;
 }