Fast path for strict closure creation.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 1f3b7797978cf8e0c6b43b8ed10f63b3318c2866..ce60d23670cc2c0aa1ec3c8051cb1880a2888df7 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -3496,9 +3496,9 @@ void LCodeGen::DoFunctionLiteral(LFunctionLiteral* instr) {
   // space for nested functions that don't need literals cloning.
   Handle<SharedFunctionInfo> shared_info = instr->shared_info();
   bool pretenure = instr->hydrogen()->pretenure();
-  if (!pretenure && shared_info->num_literals() == 0 &&
-      !shared_info->strict_mode()) {
-    FastNewClosureStub stub;
+  if (!pretenure && shared_info->num_literals() == 0) {
+    FastNewClosureStub stub(
+        shared_info->strict_mode() ? kStrictMode : kNonStrictMode);
     __ Push(shared_info);
     CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
   } else {