ARM64: re-enable turbofan tests.

test/cctest/compiler/test-changes-lowering.cc

 // Copyright 2014 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 <limits>
 
 #include "src/compiler/change-lowering.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/generic-node-inl.h"
 #include "src/compiler/js-graph.h"
@@ skipping 285 matching lines @@
   }
 
   if (Pipeline::SupportedTarget()) {
     Object* result = t.Call(0);
     Object* false_obj = t.heap()->false_value();
     CHECK_EQ(false_obj, result);
   }
 }
 
 
-#ifndef V8_TARGET_ARCH_ARM64
 #if V8_TURBOFAN_BACKEND
-// TODO(titzer): disabled on ARM64 because calling into the runtime to
-// allocate uses the wrong stack pointer.
 // TODO(titzer): disabled on ARM
 
 TEST(RunChangeInt32ToTaggedSmi) {
   ChangesLoweringTester<Object*> t;
   int32_t input;
   t.BuildLoadAndLower(t.simplified()->ChangeInt32ToTagged(),
                       t.machine()->Load(kMachInt32), &input);
 
   if (Pipeline::SupportedTarget()) {
     FOR_INT32_INPUTS(i) {
@@ skipping 84 matching lines @@
 
         input = *i;
         Object* result = t.CallWithPotentialGC<Object>();
         t.CheckNumber(input, result);
       }
     }
   }
 }
 
 #endif  // V8_TURBOFAN_BACKEND
-#endif  // !V8_TARGET_ARCH_ARM64