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

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

Index: src/crankshaft/ppc/lithium-codegen-ppc.cc
diff --git a/src/crankshaft/ppc/lithium-codegen-ppc.cc b/src/crankshaft/ppc/lithium-codegen-ppc.cc
index fabb9bbcdacf56c96951c4fd150e861b07186a86..25ed8926879077d65af9a3a6772e10040596b12e 100644
--- a/src/crankshaft/ppc/lithium-codegen-ppc.cc
+++ b/src/crankshaft/ppc/lithium-codegen-ppc.cc
@@ -3323,11 +3323,13 @@ void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
     __ bne(&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);
       __ LoadP(result, FieldMemOperand(result, Cell::kValueOffset));
-      __ CmpSmiLiteral(result, Smi::FromInt(Isolate::kArrayProtectorValid), r0);
+      __ CmpSmiLiteral(result,
+                       Smi::FromInt(Isolate::kArrayElementsProtectorValid), r0);
       DeoptimizeIf(ne, instr, Deoptimizer::kHole);
     }
     __ LoadRoot(result, Heap::kUndefinedValueRootIndex);