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

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/thread.h"
@@ skipping 214 matching lines @@
   void SetStackLimit(uword value);
   void SetStackLimitFromCurrentTOS(uword isolate_stack_top);
 
   uword stack_limit_address() const {
     return reinterpret_cast<uword>(&stack_limit_);
   }
 
   // The current stack limit.  This may be overwritten with a special
   // value to trigger interrupts.
   uword stack_limit() const { return stack_limit_; }
+  static intptr_t stack_limit_offset() {
+    return OFFSET_OF(Isolate, stack_limit_);
+  }
 
   // The true stack limit for this isolate.
   uword saved_stack_limit() const { return saved_stack_limit_; }
 
   // Stack overflow flags
   enum {
     kOsrRequest = 0x1,  // Current stack overflow caused by OSR request.
   };
 
   uword stack_overflow_flags_address() const {
@@ skipping 492 matching lines @@
   char* script_url_;
   char* library_url_;
   char* class_name_;
   char* function_name_;
   char* exception_callback_name_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_