Revert of [turbofan] Restore basic write barrier elimination.

src/compiler/machine-operator.cc

Index: src/compiler/machine-operator.cc
diff --git a/src/compiler/machine-operator.cc b/src/compiler/machine-operator.cc
index 18e310c4bd6d2bc7a8b2128576445e7931e2411f..04f75ef5386f27669653b36a34294ce0ad1069f1 100644
--- a/src/compiler/machine-operator.cc
+++ b/src/compiler/machine-operator.cc
@@ -11,6 +11,22 @@
 namespace v8 {
 namespace internal {
 namespace compiler {
+
+std::ostream& operator<<(std::ostream& os, WriteBarrierKind kind) {
+  switch (kind) {
+    case kNoWriteBarrier:
+      return os << "NoWriteBarrier";
+    case kMapWriteBarrier:
+      return os << "MapWriteBarrier";
+    case kPointerWriteBarrier:
+      return os << "PointerWriteBarrier";
+    case kFullWriteBarrier:
+      return os << "FullWriteBarrier";
+  }
+  UNREACHABLE();
+  return os;
+}
+
 
 bool operator==(StoreRepresentation lhs, StoreRepresentation rhs) {
   return lhs.representation() == rhs.representation() &&