[builtins] Add support for NewTarget to Execution::New.

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index 8778899c896d36b4fce39d89327187dc77d24ca3..6d7a5e1d086d2088349a189fe3e6850c8ff36cc3 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -3950,9 +3950,6 @@ void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
 
-  // Load original constructor into rcx.
-  __ movp(rcx, Operand(rsp, 1 * kPointerSize));
-
   // Check if the calling frame is an arguments adaptor frame.
   Label adaptor_frame, args_set_up, runtime;
   __ movp(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
@@ -3981,11 +3978,9 @@ void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   }
 
   __ bind(&args_set_up);
-  __ movp(rdi, Operand(rsp, rax, times_pointer_size, 0));
-  __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
-
-  CallConstructStub stub(isolate(), SUPER_CONSTRUCTOR_CALL);
-  __ call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
+  __ movp(rdx, Operand(rsp, rax, times_pointer_size, 1 * kPointerSize));
+  __ movp(rdi, Operand(rsp, rax, times_pointer_size, 0 * kPointerSize));
+  __ Call(isolate()->builtins()->Construct(), RelocInfo::CONSTRUCT_CALL);
 
   // Restore context register.
   __ movp(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));