[proxies] fix access issue when having proxies on the prototype-chain of global objects.

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index f0bc691e835934466eb3a9ac577b317450d10e3b..9967847c62c38c01fb838687edafb6c962835c8c 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -1586,14 +1586,23 @@ void InstanceOfStub::Generate(MacroAssembler* masm) {
   // Loop through the prototype chain looking for the {function} prototype.
   // Assume true, and change to false if not found.
   Register const object_instance_type = function_map;
+  Register const map_bit_field = function_map;
   Register const null = scratch;
   Register const result = x0;
-  Label done, loop, proxy_case;
+
+  Label done, loop, fast_runtime_fallback;
   __ LoadRoot(result, Heap::kTrueValueRootIndex);
   __ LoadRoot(null, Heap::kNullValueRootIndex);
   __ Bind(&loop);
+
+  // Check if the object needs to be access checked.
+  __ Ldrb(map_bit_field, FieldMemOperand(object_map, Map::kBitFieldOffset));
+  __ TestAndBranchIfAnySet(map_bit_field, 1 << Map::kIsAccessCheckNeeded,
+                           &fast_runtime_fallback);
+  // Check if the current object is a Proxy.
   __ CompareInstanceType(object_map, object_instance_type, JS_PROXY_TYPE);
-  __ B(eq, &proxy_case);
+  __ B(eq, &fast_runtime_fallback);
+
   __ Ldr(object, FieldMemOperand(object_map, Map::kPrototypeOffset));
   __ Cmp(object, function_prototype);
   __ B(eq, &done);
@@ -1605,8 +1614,8 @@ void InstanceOfStub::Generate(MacroAssembler* masm) {
   __ StoreRoot(result, Heap::kInstanceofCacheAnswerRootIndex);
   __ Ret();
 
-  // Proxy-case: Call the %HasInPrototypeChain runtime function.
-  __ Bind(&proxy_case);
+  // Found Proxy or access check needed: Call the runtime
+  __ Bind(&fast_runtime_fallback);
   __ Push(object, function_prototype);
   // Invalidate the instanceof cache.
   __ Move(scratch, Smi::FromInt(0));