Fix stack sizes (kDefaultStackSize to 64kB, and kStackSizeBuffer to 4kb) to be able to catch stack …

runtime/vm/isolate.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 VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/class_table.h"
@@ skipping 180 matching lines @@
   }
 
  private:
   Isolate();
 
   void BuildName(const char* name_prefix);
   void PrintInvokedFunctions();
 
   static uword GetSpecifiedStackSize();
 
-  static const uword kStackSizeBuffer = (128 * KB);
-  static const uword kDefaultStackSize = (1 * MB);
+  static const uword kStackSizeBuffer = (4 * KB);
+  static const uword kDefaultStackSize = (128 * KB);
 
   static ThreadLocalKey isolate_key;
   StoreBufferBlock store_buffer_;
   ClassTable class_table_;
   Dart_MessageNotifyCallback message_notify_callback_;
   char* name_;
   Dart_Port main_port_;
   Heap* heap_;
   ObjectStore* object_store_;
   RawContext* top_context_;
@@ skipping 83 matching lines @@
   Isolate* new_isolate_;
   Isolate* saved_isolate_;
   uword saved_stack_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(SwitchIsolateScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_