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

runtime/vm/stub_code_x64.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1862 matching lines @@
 // Result in RCX: null -> not found, otherwise result (true or false).
 void StubCode::GenerateSubtype4TestCacheStub(Assembler* assembler) {
   GenerateSubtypeNTestCacheStub(assembler, 4);
 }
 
 
 // Return the current stack pointer address, used to stack alignment
 // checks.
 // TOS + 0: return address
 // Result in RAX.
-void StubCode::GenerateGetStackPointerStub(Assembler* assembler) {
+void StubCode::GenerateGetCStackPointerStub(Assembler* assembler) {
   __ leaq(RAX, Address(RSP, kWordSize));
   __ ret();
 }
 
 
 // Jump to a frame on the call stack.
 // TOS + 0: return address
 // Arg1: program counter
 // Arg2: stack pointer
 // Arg3: frame_pointer
@@ skipping 425 matching lines @@
 }
 
 
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ int3();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64