[arm64] Fix the GetStackPointer stub to return the C stack pointer.

runtime/vm/native_arguments.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_NATIVE_ARGUMENTS_H_
 #define RUNTIME_VM_NATIVE_ARGUMENTS_H_
 
 #include "platform/assert.h"
 #include "platform/memory_sanitizer.h"
 #include "vm/globals.h"
@@ skipping 23 matching lines @@
     ASSERT(Utils::IsAligned(current_sp, OS::ActivationFrameAlignment()));      \
   }
 #elif defined(HOST_OS_WINDOWS)
 // The compiler may dynamically align the stack on Windows, so do not check.
 #define CHECK_STACK_ALIGNMENT                                                  \
   {}
 #else
 #define CHECK_STACK_ALIGNMENT                                                  \
   {                                                                            \
     uword (*func)() = reinterpret_cast<uword (*)()>(                           \
-        StubCode::GetStackPointer_entry()->EntryPoint());                      \
+        StubCode::GetCStackPointer_entry()->EntryPoint());                     \
     uword current_sp = func();                                                 \
     ASSERT(Utils::IsAligned(current_sp, OS::ActivationFrameAlignment()));      \
   }
 #endif
 
 void VerifyOnTransition();
 
 #define VERIFY_ON_TRANSITION                                                   \
   if (FLAG_verify_on_transition) {                                             \
     VerifyOnTransition();                                                      \
@@ skipping 179 matching lines @@
 
   Thread* thread_;      // Current thread pointer.
   intptr_t argc_tag_;   // Encodes argument count and invoked native call type.
   RawObject** argv_;    // Pointer to an array of arguments to runtime call.
   RawObject** retval_;  // Pointer to the return value area.
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_NATIVE_ARGUMENTS_H_