Only fold polymorphic into monomorphic load if all load from either receiver or same prototype.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index f59f988534f20c3b7a63fdb7cc0425b8d0c3e4b5..3705042adc7cff58c835e3894ed697c63766e9ad 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -4707,10 +4707,14 @@ bool HOptimizedGraphBuilder::PropertyAccessInfo::IsCompatibleForLoad(
   if (!LookupDescriptor()) return false;
 
   if (!lookup_.IsFound()) {
-    return (!info->lookup_.IsFound() || !info->holder_.is_null()) &&
+    return (!info->lookup_.IsFound() || info->has_holder()) &&
         map_->prototype() == info->map_->prototype();
   }
 
+  // Mismatch if the other access info found the property in the prototype
+  // chain.
+  if (info->has_holder()) return false;
+
   if (lookup_.IsPropertyCallbacks()) {
     return accessor_.is_identical_to(info->accessor_);
   }