Set the stack base value for thread pool threads at the start so that profile ticks for threads sho…

runtime/vm/thread.cc

 // Copyright (c) 2015, 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/thread.h"
 
 #include "vm/dart_api_state.h"
 #include "vm/growable_array.h"
 #include "vm/isolate.h"
 #include "vm/lockers.h"
@@ skipping 313 matching lines @@
 
 void Thread::ClearStackLimit() {
   SetStackLimit(~static_cast<uword>(0));
 }
 
 
 /* static */
 uword Thread::GetCurrentStackPointer() {
   // Since AddressSanitizer's detect_stack_use_after_return instruments the
   // C++ code to give out fake stack addresses, we call a stub in that case.
+  ASSERT(StubCode::GetStackPointer_entry() != NULL);
   uword (*func)() = reinterpret_cast<uword (*)()>(
       StubCode::GetStackPointer_entry()->EntryPoint());
   // But for performance (and to support simulators), we normally use a local.
 #if defined(__has_feature)
 #if __has_feature(address_sanitizer)
   uword current_sp = func();
   return current_sp;
 #else
   uword stack_allocated_local_address = reinterpret_cast<uword>(&func);
   return stack_allocated_local_address;
@@ skipping 359 matching lines @@
 
 DisableThreadInterruptsScope::~DisableThreadInterruptsScope() {
   if (thread() != NULL) {
     OSThread* os_thread = thread()->os_thread();
     ASSERT(os_thread != NULL);
     os_thread->EnableThreadInterrupts();
   }
 }
 
 }  // namespace dart