[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 edc0d696b02d2b8de142f8e05a53ef947ed3a7a8..07602461fb2465898c20224cf1cd10a9b7b04f89 100644
--- a/src/crankshaft/ppc/lithium-codegen-ppc.cc
+++ b/src/crankshaft/ppc/lithium-codegen-ppc.cc
@@ -3129,8 +3129,8 @@ 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
-      // it needs to bail out.
+      // protector cell contains (Smi) Isolate::kArrayProtectorValid.
+      // Otherwise it needs to bail out.
       __ LoadRoot(result, Heap::kArrayProtectorRootIndex);
       __ LoadP(result, FieldMemOperand(result, Cell::kValueOffset));
       __ CmpSmiLiteral(result, Smi::FromInt(Isolate::kArrayProtectorValid), r0);