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

src/crankshaft/arm64/lithium-codegen-arm64.cc

Index: src/crankshaft/arm64/lithium-codegen-arm64.cc
diff --git a/src/crankshaft/arm64/lithium-codegen-arm64.cc b/src/crankshaft/arm64/lithium-codegen-arm64.cc
index 292014a5d53d3638880363f01cf414934d0cd022..ecc5afd08f406b06694222d9ba94a79ec0468c8b 100644
--- a/src/crankshaft/arm64/lithium-codegen-arm64.cc
+++ b/src/crankshaft/arm64/lithium-codegen-arm64.cc
@@ -3471,11 +3471,13 @@ void LCodeGen::DoLoadKeyedFixed(LLoadKeyedFixed* instr) {
     __ B(ne, &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);
       __ Ldr(result, FieldMemOperand(result, Cell::kValueOffset));
-      __ Cmp(result, Operand(Smi::FromInt(Isolate::kArrayProtectorValid)));
+      __ Cmp(result,
+             Operand(Smi::FromInt(Isolate::kArrayElementsProtectorValid)));
       DeoptimizeIf(ne, instr, Deoptimizer::kHole);
     }
     __ LoadRoot(result, Heap::kUndefinedValueRootIndex);