MIPS: Fix `[proxies] fix access issue when having proxies on the...

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

Port 2c75e3d2

Original commit message:
We can no longer just walk the prototype chain without doing proper access-checks. When installing a proxy as the __proto__ of the global object we might accidentally end up invoking cross-realm code without access-checks (see proxies-cross-realm-ecxeption.js).

BUG=

Review URL: https://codereview.chromium.org/1526253006

Cr-Commit-Position: refs/heads/master@{#32921}

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

@@ -2546,14 +2546,25 @@ void LCodeGen::DoHasInPrototypeChainAndBranch(
     __ 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);

src/crankshaft/mips64/lithium-codegen-mips64.cc

@@ -2674,10 +2674,19 @@ void LCodeGen::DoHasInPrototypeChainAndBranch(
   __ ld(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));
   __ lbu(object_instance_type,
          FieldMemOperand(object_map, Map::kInstanceTypeOffset));
   DeoptimizeIf(eq, instr, Deoptimizer::kProxy, object_instance_type,
                Operand(JS_PROXY_TYPE));
+
   __ ld(object_prototype, FieldMemOperand(object_map, Map::kPrototypeOffset));
   EmitTrueBranch(instr, eq, object_prototype, Operand(prototype));
   __ LoadRoot(at, Heap::kNullValueRootIndex);