Merge branch 'upstream-master' into 58-based

Change-Id: I8c280ca9068fdda9cf6276725bfb8608eccb497a

1 files changed, 8 insertions, 3 deletions

diff --git a/chromium/v8/src/compiler/node-properties.h b/chromium/v8/src/compiler/node-properties.h
index c82d78a6158..5ed85402d1f 100644
--- a/chromium/v8/src/compiler/node-properties.h
+++ b/chromium/v8/src/compiler/node-properties.h
@@ -128,10 +128,15 @@ class V8_EXPORT_PRIVATE NodeProperties final {
   static bool IsSame(Node* a, Node* b);
 
   // Walks up the {effect} chain to find a witness that provides map
-  // information about the {receiver}. Doesn't look through potentially
+  // information about the {receiver}. Can look through potentially
   // side effecting nodes.
-  static bool InferReceiverMaps(Node* receiver, Node* effect,
-                                ZoneHandleSet<Map>* maps_return);
+  enum InferReceiverMapsResult {
+    kNoReceiverMaps,         // No receiver maps inferred.
+    kReliableReceiverMaps,   // Receiver maps can be trusted.
+    kUnreliableReceiverMaps  // Receiver maps might have changed (side-effect).
+  };
+  static InferReceiverMapsResult InferReceiverMaps(
+      Node* receiver, Node* effect, ZoneHandleSet<Map>* maps_return);
 
   // ---------------------------------------------------------------------------
   // Context.