Revert of [turbofan] Restore basic write barrier elimination.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index c7e59198b10f805765991ec5320adce8b792eda0..15ff8bfeb727842c6ea0c336ea23468eaadd9d09 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -452,33 +452,6 @@
   kSimd128Unaligned
 };
 
-// Supported write barrier modes.
-enum WriteBarrierKind : uint8_t {
-  kNoWriteBarrier,
-  kMapWriteBarrier,
-  kPointerWriteBarrier,
-  kFullWriteBarrier
-};
-
-inline size_t hash_value(WriteBarrierKind kind) {
-  return static_cast<uint8_t>(kind);
-}
-
-inline 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;
-}
-
 // A flag that indicates whether objects should be pretenured when
 // allocated (allocated directly into the old generation) or not
 // (allocated in the young generation if the object size and type