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

src/crankshaft/x64/lithium-codegen-x64.cc

Index: src/crankshaft/x64/lithium-codegen-x64.cc
diff --git a/src/crankshaft/x64/lithium-codegen-x64.cc b/src/crankshaft/x64/lithium-codegen-x64.cc
index 244363367165d9b9056492c5f56f4d7d55653cb1..98298718df836e37b41ce27298671440facfc445 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -2928,8 +2928,8 @@ 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
-      // it needs to bail out.
+      // protector cell contains (Smi) Isolate::kArrayProtectorValid.
+      // Otherwise it needs to bail out.
       __ LoadRoot(result, Heap::kArrayProtectorRootIndex);
       __ Cmp(FieldOperand(result, Cell::kValueOffset),
              Smi::FromInt(Isolate::kArrayProtectorValid));