Fast path for strict closure creation.

src/x64/codegen-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4245 matching lines @@
     bool pretenure) {
   // The inevitable call will sync frame elements to memory anyway, so
   // we do it eagerly to allow us to push the arguments directly into
   // place.
   frame_->SyncRange(0, frame_->element_count() - 1);
 
   // Use the fast case closure allocation code that allocates in new
   // space for nested functions that don't need literals cloning.
   if (!pretenure &&
       scope()->is_function_scope() &&
-      function_info->num_literals() == 0 &&
-      !function_info->strict_mode()) {  // Strict mode functions use slow path.
-    FastNewClosureStub stub;
+      function_info->num_literals() == 0) {
+    FastNewClosureStub stub(
+        function_info->strict_mode() ? kStrictMode : kNonStrictMode);
     frame_->Push(function_info);
     Result answer = frame_->CallStub(&stub, 1);
     frame_->Push(&answer);
   } else {
     // Call the runtime to instantiate the function based on the
     // shared function info.
     frame_->EmitPush(rsi);
     frame_->EmitPush(function_info);
     frame_->EmitPush(pretenure
                      ? Factory::true_value()
@@ skipping 4556 matching lines @@
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64