[api] Expose FunctionCallbackInfo::NewTarget

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index f489a90c37d9e46a541f62083558e4d6b7efe478..2414d90e34318aece00fb2e9da02404cfa64b0d5 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -5404,10 +5404,14 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
   STATIC_ASSERT(FCA::kIsolateIndex == 1);
   STATIC_ASSERT(FCA::kHolderIndex == 0);
-  STATIC_ASSERT(FCA::kArgsLength == 7);
+  STATIC_ASSERT(FCA::kNewTargetIndex == 7);
+  STATIC_ASSERT(FCA::kArgsLength == 8);
 
   __ PopReturnAddressTo(return_address);
 
+  // new target
+  __ PushRoot(Heap::kUndefinedValueRootIndex);
+
   // context save
   __ Push(context);
 
@@ -5441,7 +5445,7 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
 
   // Allocate the v8::Arguments structure in the arguments' space since
   // it's not controlled by GC.
-  const int kApiStackSpace = 4;
+  const int kApiStackSpace = 3;
 
   PrepareCallApiFunction(masm, kApiStackSpace);
 
@@ -5453,8 +5457,6 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   __ movp(StackSpaceOperand(1), scratch);
   // FunctionCallbackInfo::length_.
   __ Set(StackSpaceOperand(2), argc);
-  // FunctionCallbackInfo::is_construct_call_.
-  __ Set(StackSpaceOperand(3), 0);
 
 #if defined(__MINGW64__) || defined(_WIN64)
   Register arguments_arg = rcx;
@@ -5479,11 +5481,11 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
                                        ARGUMENTS_DONT_CONTAIN_RECEIVER);
   Operand context_restore_operand = args_from_rbp.GetArgumentOperand(
       FCA::kArgsLength - FCA::kContextSaveIndex);
-  Operand is_construct_call_operand = StackSpaceOperand(3);
+  Operand length_operand = StackSpaceOperand(2);
   Operand return_value_operand = args_from_rbp.GetArgumentOperand(
       this->is_store() ? 0 : FCA::kArgsLength - FCA::kReturnValueOffset);
   int stack_space = 0;
-  Operand* stack_space_operand = &is_construct_call_operand;
+  Operand* stack_space_operand = &length_operand;
   stack_space = argc + FCA::kArgsLength + 1;
   stack_space_operand = nullptr;
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, callback_arg,