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

src/crankshaft/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.7
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2528 matching lines @@
   Register const object_prototype = object_map;
   Register const prototype = ToRegister(instr->prototype());
 
   // The {object} must be a spec object.  It's sufficient to know that {object}
   // is not a smi, since all other non-spec objects have {null} prototypes and
   // will be ruled out below.
   if (instr->hydrogen()->ObjectNeedsSmiCheck()) {
     __ SmiTst(object, at);
     EmitFalseBranch(instr, eq, at, Operand(zero_reg));
   }
+
   // Loop through the {object}s prototype chain looking for the {prototype}.
   __ lw(object_map, FieldMemOperand(object, HeapObject::kMapOffset));
   Label loop;
   __ bind(&loop);
+
+  // Deoptimize if the object needs to be access checked.
+  __ lbu(object_instance_type,
+         FieldMemOperand(object_map, Map::kBitFieldOffset));
+  __ And(object_instance_type, object_instance_type,
+         Operand(1 << Map::kIsAccessCheckNeeded));
+  DeoptimizeIf(ne, instr, Deoptimizer::kAccessCheck, object_instance_type,
+               Operand(zero_reg));
+  // Deoptimize for proxies.
   __ lbu(object_instance_type,
          FieldMemOperand(object_map, Map::kInstanceTypeOffset));
   DeoptimizeIf(eq, instr, Deoptimizer::kProxy, object_instance_type,
                Operand(JS_PROXY_TYPE));
+
   __ lw(object_prototype, FieldMemOperand(object_map, Map::kPrototypeOffset));
   EmitTrueBranch(instr, eq, object_prototype, Operand(prototype));
   __ LoadRoot(at, Heap::kNullValueRootIndex);
   EmitFalseBranch(instr, eq, object_prototype, Operand(at));
   __ Branch(USE_DELAY_SLOT, &loop);
   __ lw(object_map, FieldMemOperand(object_prototype, HeapObject::kMapOffset));
 }
 
 
 void LCodeGen::DoCmpT(LCmpT* instr) {
@@ skipping 3098 matching lines @@
   __ Push(at, ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8