Fastpath some spread-call desugaring.

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 43131e37e4130763384cf38f0f95a48cefc58b00..688904099682310f13c1c2aa586dfc7a6e358ad0 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -2822,11 +2822,11 @@ 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::kProtectorValid. Otherwise
       // it needs to bail out.
       __ LoadRoot(result, Heap::kArrayProtectorRootIndex);
       __ Cmp(FieldOperand(result, Cell::kValueOffset),
-             Smi::FromInt(Isolate::kArrayProtectorValid));
+             Smi::FromInt(Isolate::kProtectorValid));
       DeoptimizeIf(not_equal, instr, DeoptimizeReason::kHole);
     }
     __ Move(result, isolate()->factory()->undefined_value());