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

src/crankshaft/x87/lithium-codegen-x87.cc

Index: src/crankshaft/x87/lithium-codegen-x87.cc
diff --git a/src/crankshaft/x87/lithium-codegen-x87.cc b/src/crankshaft/x87/lithium-codegen-x87.cc
index c72483ede33321ef757b194ac1ed48e5d68872d0..4bc3183f01117fdece1b53fd90342bf429ce5c2e 100644
--- a/src/crankshaft/x87/lithium-codegen-x87.cc
+++ b/src/crankshaft/x87/lithium-codegen-x87.cc
@@ -3317,11 +3317,12 @@ void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
     __ 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.
-      __ mov(result, isolate()->factory()->array_protector());
+      __ LoadRoot(result, Heap::kArrayElementsProtectorRootIndex);
       __ cmp(FieldOperand(result, PropertyCell::kValueOffset),
-             Immediate(Smi::FromInt(Isolate::kArrayProtectorValid)));
+             Immediate(Smi::FromInt(Isolate::kArrayElementsProtectorValid)));
       DeoptimizeIf(not_equal, instr, Deoptimizer::kHole);
     }
     __ mov(result, isolate()->factory()->undefined_value());