[turbofan] Inline calls to CPP builtins

src/builtins/x64/builtins-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 10 matching lines @@
   //  -- rdi                 : target
   //  -- rdx                 : new.target
   //  -- rsp[0]              : return address
   //  -- rsp[8]              : last argument
   //  -- ...
   //  -- rsp[8 * argc]       : first argument
   //  -- rsp[8 * (argc + 1)] : receiver
   // -----------------------------------
   __ AssertFunction(rdi);
 
+  // The logic contained here is mirrored for TurboFan inlining in
+  // JSTypedLowering::ReduceJSCall{Function,Construct}. Keep these in sync.
+
   // Make sure we operate in the context of the called function (for example
   // ConstructStubs implemented in C++ will be run in the context of the caller
   // instead of the callee, due to the way that [[Construct]] is defined for
   // ordinary functions).
   __ movp(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
   // JumpToExternalReference expects rax to contain the number of arguments
   // including the receiver and the extra arguments.
   const int num_extra_args = 3;
   __ addp(rax, Immediate(num_extra_args + 1));
@@ skipping 3032 matching lines @@
 void Builtins::Generate_InterpreterOnStackReplacement(MacroAssembler* masm) {
   Generate_OnStackReplacementHelper(masm, true);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64