Restore special interceptor stub for keyed loads.

src/ic/x64/ic-x64.cc

Index: src/ic/x64/ic-x64.cc
diff --git a/src/ic/x64/ic-x64.cc b/src/ic/x64/ic-x64.cc
index f125322645ceaf6a565f80187a6a86d51ea926c7..a95e135bb522859542dc6a2c35df6f65c1ee2d9d 100644
--- a/src/ic/x64/ic-x64.cc
+++ b/src/ic/x64/ic-x64.cc
@@ -403,6 +403,49 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
 }
 
 
+void KeyedLoadIC::GenerateIndexedInterceptor(MacroAssembler* masm) {
+  // Return address is on the stack.
+  Label slow;
+
+  Register receiver = LoadDescriptor::ReceiverRegister();
+  Register key = LoadDescriptor::NameRegister();
+  Register scratch = rax;
+  DCHECK(!scratch.is(receiver) && !scratch.is(key));
+
+  // Check that the receiver isn't a smi.
+  __ JumpIfSmi(receiver, &slow);
+
+  // Check that the key is an array index, that is Uint32.
+  STATIC_ASSERT(kSmiValueSize <= 32);
+  __ JumpUnlessNonNegativeSmi(key, &slow);
+
+  // Get the map of the receiver.
+  __ movp(scratch, FieldOperand(receiver, HeapObject::kMapOffset));
+
+  // Check that it has indexed interceptor and access checks
+  // are not enabled for this object.
+  __ movb(scratch, FieldOperand(scratch, Map::kBitFieldOffset));
+  __ andb(scratch, Immediate(kSlowCaseBitFieldMask));
+  __ cmpb(scratch, Immediate(1 << Map::kHasIndexedInterceptor));
+  __ j(not_zero, &slow);
+
+  // Everything is fine, call runtime.
+  __ PopReturnAddressTo(scratch);
+  __ Push(receiver);  // receiver
+  __ Push(key);       // key
+  __ PushReturnAddressFrom(scratch);
+
+  // Perform tail call to the entry.
+  __ TailCallExternalReference(
+      ExternalReference(IC_Utility(IC::kLoadElementWithInterceptor),
+                        masm->isolate()),
+      2, 1);
+
+  __ bind(&slow);
+  GenerateMiss(masm);
+}
+
+
 static void KeyedStoreGenerateMegamorphicHelper(
     MacroAssembler* masm, Label* fast_object, Label* fast_double, Label* slow,
     KeyedStoreCheckMap check_map, KeyedStoreIncrementLength increment_length) {