[runtime] Avoid @@isConcatSpreadable lookup for fast path Array.prototype.concat

src/crankshaft/x64/lithium-codegen-x64.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_X64
 
 #include "src/crankshaft/x64/lithium-codegen-x64.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 3103 matching lines @@
       __ CompareRoot(result, Heap::kTheHoleValueRootIndex);
       DeoptimizeIf(equal, instr, Deoptimizer::kHole);
     }
   } else if (hinstr->hole_mode() == CONVERT_HOLE_TO_UNDEFINED) {
     DCHECK(hinstr->elements_kind() == FAST_HOLEY_ELEMENTS);
     Label done;
     __ CompareRoot(result, Heap::kTheHoleValueRootIndex);
     __ j(not_equal, &done);
     if (info()->IsStub()) {
       // A stub can safely convert the hole to undefined only if the array
-      // protector cell contains (Smi) Isolate::kArrayProtectorValid. Otherwise
+      // protector cell contains (Smi) Isolate::kArrayElementsProtectorValid.
+      // Otherwise
       // it needs to bail out.
-      __ LoadRoot(result, Heap::kArrayProtectorRootIndex);
+      __ LoadRoot(result, Heap::kArrayElementsProtectorRootIndex);
       __ Cmp(FieldOperand(result, Cell::kValueOffset),
-             Smi::FromInt(Isolate::kArrayProtectorValid));
+             Smi::FromInt(Isolate::kArrayElementsProtectorValid));
       DeoptimizeIf(not_equal, instr, Deoptimizer::kHole);
     }
     __ Move(result, isolate()->factory()->undefined_value());
     __ bind(&done);
   }
 }
 
 
 void LCodeGen::DoLoadKeyed(LLoadKeyed* instr) {
   if (instr->is_fixed_typed_array()) {
@@ skipping 2730 matching lines @@
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64