new classes: change semantics of super(...) call and add new.target to construct stub.

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 f7bd9b6a31005bfe6f879eab5a928ffaa6ede4bd..f6647c3845c6f1359470efe2481e86ac1b80a195 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -2017,6 +2017,9 @@ void CallConstructStub::Generate(MacroAssembler* masm) {
     __ AssertUndefinedOrAllocationSite(rbx);
   }
 
+  // Pass original constructor to construct stub.
+  __ movp(r11, rdi);
+
   // Jump to the function-specific construct stub.
   Register jmp_reg = rcx;
   __ movp(jmp_reg, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));