[fullcodegen] Add support for %_GetSuperConstructor.

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/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 3608 matching lines @@
   __ AssertString(rax);
 
   __ movl(rax, FieldOperand(rax, String::kHashFieldOffset));
   DCHECK(String::kHashShift >= kSmiTagSize);
   __ IndexFromHash(rax, rax);
 
   context()->Plug(rax);
 }
 
 
+void FullCodeGenerator::EmitGetSuperConstructor(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK_EQ(1, args->length());
+  VisitForAccumulatorValue(args->at(0));
+  __ AssertFunction(rax);
+  __ movp(rax, FieldOperand(rax, HeapObject::kMapOffset));
+  __ movp(rax, FieldOperand(rax, Map::kPrototypeOffset));
+  context()->Plug(rax);
+}
+
+
 void FullCodeGenerator::EmitFastOneByteArrayJoin(CallRuntime* expr) {
   Label bailout, return_result, done, one_char_separator, long_separator,
       non_trivial_array, not_size_one_array, loop,
       loop_1, loop_1_condition, loop_2, loop_2_entry, loop_3, loop_3_entry;
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 2);
   // We will leave the separator on the stack until the end of the function.
   VisitForStackValue(args->at(1));
   // Load this to rax (= array)
   VisitForAccumulatorValue(args->at(0));
@@ skipping 1126 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