new classes: implement new.target passing to superclass constructor.

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index 80a41dde16c6d06b570347c9d2772fb1795db1b3..ca23b369234953fca11edbe9658e53f78f539969 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -516,6 +516,9 @@ void Builtins::Generate_JSConstructStubForDerived(MacroAssembler* masm) {
     __ Push(rax);
     __ SmiToInteger32(rax, rax);
 
+    // Push new.target
+    __ Push(rdx);
+
     // receiver is the hole.
     __ Push(masm->isolate()->factory()->the_hole_value());
 
@@ -533,6 +536,7 @@ void Builtins::Generate_JSConstructStubForDerived(MacroAssembler* masm) {
     __ j(greater_equal, &loop);
 
     // Call the function.
+    __ incp(rax);  // Pushed new.target.
     ParameterCount actual(rax);
     __ InvokeFunction(rdi, actual, CALL_FUNCTION, NullCallWrapper());