Active smi-only optimizations for large array literals.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index 1d9b8fffc2ba31442de8df8b9edddc25620ef549..d96efbf8c2abe5a93707b76edb577b2b609994bf 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -1467,12 +1467,10 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
                         kDontSaveFPRegs,
                         EMIT_REMEMBERED_SET,
                         OMIT_SMI_CHECK);
-    if (FLAG_smi_only_arrays) {
-      __ movq(rdi, FieldOperand(rbx, JSObject::kMapOffset));
-      __ CheckFastSmiOnlyElements(rdi, &no_map_change, Label::kNear);
-      __ push(r8);
-      __ CallRuntime(Runtime::kNonSmiElementStored, 1);
-    }
+    __ movq(rdi, FieldOperand(rbx, JSObject::kMapOffset));
+    __ CheckFastSmiOnlyElements(rdi, &no_map_change, Label::kNear);
+    __ push(r8);
+    __ CallRuntime(Runtime::kNonSmiElementStored, 1);
     __ bind(&no_map_change);
 
     PrepareForBailoutForId(expr->GetIdForElement(i), NO_REGISTERS);