Desugar %DefaultConstructorCallSuper partially in parser.

src/full-codegen/x64/full-codegen-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/code-stubs.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
@@ skipping 3990 matching lines @@
   __ bind(&done);
 
   context()->Plug(rax);
 }
 
 
 void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 2);
 
-  // new.target
+  // Evaluate new.target and super constructor.
   VisitForStackValue(args->at(0));
-
-  // .this_function
   VisitForStackValue(args->at(1));
-  __ CallRuntime(Runtime::kGetPrototype, 1);
-  __ Push(result_register());
 
   // 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));
   __ movp(rbx, Operand(rdx, StandardFrameConstants::kContextOffset));
   __ Cmp(rbx, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
   __ j(equal, &adaptor_frame);
@@ skipping 1227 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64