Fast path for strict closure creation.

src/x64/lithium-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 3478 matching lines @@
     __ movq(FieldOperand(rax, size - kPointerSize), rdx);
   }
 }
 
 
 void LCodeGen::DoFunctionLiteral(LFunctionLiteral* instr) {
   // Use the fast case closure allocation code that allocates in new
   // 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 {
     __ push(rsi);
     __ Push(shared_info);
     __ PushRoot(pretenure ?
                 Heap::kTrueValueRootIndex :
                 Heap::kFalseValueRootIndex);
     CallRuntime(Runtime::kNewClosure, 3, instr);
   }
@@ skipping 252 matching lines @@
   RegisterEnvironmentForDeoptimization(environment);
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64