Fixes to run "Hello, world!" on arm64 hardware.

runtime/vm/object_arm64_test.cc

 // Copyright (c) 2014, 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 "platform/assert.h"
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/object.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 #define __ assembler->
 
 // Generate a simple dart code sequence.
 // This is used to test Code and Instruction object creation.
 void GenerateIncrement(Assembler* assembler) {
+  __ mov(SP, CSP);
   __ movz(R0, 0, 0);
   __ Push(R0);
   __ add(R0, R0, Operand(1));
   __ str(R0, Address(SP));
   __ ldr(R1, Address(SP));
   __ add(R1, R1, Operand(1));
   __ Pop(R0);
   __ mov(R0, R1);
   __ ret();
 }
 
 
 // Generate a dart code sequence that embeds a string object in it.
 // This is used to test Embedded String objects in the instructions.
 void GenerateEmbedStringInCode(Assembler* assembler, const char* str) {
   const String& string_object =
       String::ZoneHandle(String::New(str, Heap::kOld));
+  __ mov(SP, CSP);
   __ TagAndPushPP();  // Save caller's pool pointer and load a new one here.
   __ LoadPoolPointer(PP);
   __ LoadObject(R0, string_object, PP);
   __ PopAndUntagPP();  // Restore caller's pool pointer.
   __ ret();
 }
 
 
 // Generate a dart code sequence that embeds a smi object in it.
 // This is used to test Embedded Smi objects in the instructions.
 void GenerateEmbedSmiInCode(Assembler* assembler, intptr_t value) {
   const Smi& smi_object = Smi::ZoneHandle(Smi::New(value));
   const int64_t val = reinterpret_cast<int64_t>(smi_object.raw());
   __ LoadImmediate(R0, val, kNoRegister);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64