[turbofan] Enable concurrent (re)compilation.

src/compiler/node-properties.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_NODE_PROPERTIES_H_
 #define V8_COMPILER_NODE_PROPERTIES_H_
 
 #include "src/compiler/node.h"
 #include "src/types.h"
 
@@ skipping 106 matching lines @@
   }
   static Bounds GetBounds(Node* node) {
     DCHECK(IsTyped(node));
     return node->bounds();
   }
   static void SetBounds(Node* node, Bounds bounds) {
     DCHECK_NOT_NULL(bounds.lower);
     DCHECK_NOT_NULL(bounds.upper);
     node->set_bounds(bounds);
   }
+  static void CopyBounds(Node* dst, Node* src) {
+    dst->set_bounds(src->bounds());
+  }
   static void RemoveBounds(Node* node) { node->set_bounds(Bounds()); }
   static bool AllValueInputsAreTyped(Node* node);
 
  private:
   static inline bool IsInputRange(Edge edge, int first, int count);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_NODE_PROPERTIES_H_