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

src/arm64/code-stubs-arm64.cc

 // 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 1568 matching lines @@
   __ AssertNotSmi(function_prototype);
 
   // Update the global instanceof cache with the current {object} map and
   // {function}.  The cached answer will be set when it is known below.
   __ StoreRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
   __ StoreRoot(object_map, Heap::kInstanceofCacheMapRootIndex);
 
   // 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);
   __ Cmp(object, null);
   __ Ldr(object_map, FieldMemOperand(object, HeapObject::kMapOffset));
   __ B(ne, &loop);
   __ LoadRoot(result, Heap::kFalseValueRootIndex);
   __ Bind(&done);
   __ 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));
   __ StoreRoot(scratch, Heap::kInstanceofCacheFunctionRootIndex);
   __ TailCallRuntime(Runtime::kHasInPrototypeChain, 2, 1);
 
   // Slow-case: Call the %InstanceOf runtime function.
   __ bind(&slow_case);
   __ Push(object, function);
   __ TailCallRuntime(Runtime::kInstanceOf, 2, 1);
@@ skipping 4172 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64