[arm64] Address TODO in CallConstructStub::Generate.

src/arm64/macro-assembler-arm64.cc

 // Copyright 2013 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 889 matching lines @@
   DCHECK(dst0.IsValid());
 
   int count = 1 + dst1.IsValid() + dst2.IsValid() + dst3.IsValid();
   int size = dst0.SizeInBytes();
 
   PopHelper(count, size, dst0, dst1, dst2, dst3);
   PopPostamble(count, size);
 }
 
 
+void MacroAssembler::Pop(const CPURegister& dst0, const CPURegister& dst1,
+                         const CPURegister& dst2, const CPURegister& dst3,
+                         const CPURegister& dst4, const CPURegister& dst5,
+                         const CPURegister& dst6, const CPURegister& dst7) {
+  // It is not valid to pop into the same register more than once in one
+  // instruction, not even into the zero register.
+  DCHECK(!AreAliased(dst0, dst1, dst2, dst3, dst4, dst5, dst6, dst7));
+  DCHECK(AreSameSizeAndType(dst0, dst1, dst2, dst3, dst4, dst5, dst6, dst7));
+  DCHECK(dst0.IsValid());
+
+  int count = 5 + dst5.IsValid() + dst6.IsValid() + dst7.IsValid();
+  int size = dst0.SizeInBytes();
+
+  PopHelper(4, size, dst0, dst1, dst2, dst3);
+  PopHelper(count - 4, size, dst4, dst5, dst6, dst7);
+  PopPostamble(count, size);
+}
+
+
 void MacroAssembler::Push(const Register& src0, const FPRegister& src1) {
   int size = src0.SizeInBytes() + src1.SizeInBytes();
 
   PushPreamble(size);
   // Reserve room for src0 and push src1.
   str(src1, MemOperand(StackPointer(), -size, PreIndex));
   // Fill the gap with src0.
   str(src0, MemOperand(StackPointer(), src1.SizeInBytes()));
 }
 
@@ skipping 4217 matching lines @@
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64