Have the stack overflow code use the correct stack size set by the platform/thread.h

vm/isolate.cc

 // 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "lib/mirrors.h"
 #include "vm/compiler_stats.h"
@@ skipping 236 matching lines @@
   const char* kFormat = "%s-%lld";
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, name_prefix, main_port()) + 1;
   name_ = new char[len];
   OS::SNPrint(name_, len, kFormat, name_prefix, main_port());
 }
 
 
 // TODO(5411455): Use flag to override default value and Validate the
 // stack size by querying OS.
 uword Isolate::GetSpecifiedStackSize() {
-  uword stack_size = Isolate::kDefaultStackSize - Isolate::kStackSizeBuffer;
+  ASSERT(Isolate::kStackSizeBuffer < Thread::GetMaxStackSize());
+  uword stack_size = Thread::GetMaxStackSize() - Isolate::kStackSizeBuffer;
   return stack_size;
 }
 
 
 void Isolate::SetStackLimitFromCurrentTOS(uword stack_top_value) {
   SetStackLimit(stack_top_value - GetSpecifiedStackSize());
 }
 
 
 void Isolate::SetStackLimit(uword limit) {
@@ skipping 196 matching lines @@
 
 
 void Isolate::VisitWeakPersistentHandles(HandleVisitor* visitor,
                                          bool visit_prologue_weak_handles) {
   if (api_state() != NULL) {
     api_state()->VisitWeakHandles(visitor, visit_prologue_weak_handles);
   }
 }
 
 }  // namespace dart