- Add an OSThread structure which is the generic TLS structure for all C++

runtime/vm/profiler.cc

Index: runtime/vm/profiler.cc
diff --git a/runtime/vm/profiler.cc b/runtime/vm/profiler.cc
index d1d52b887ddfbbaeaf5122a46963658a489df7b8..cc6e6b8fc044cc983ccec44b0b1cf6df4c5639b5 100644
--- a/runtime/vm/profiler.cc
+++ b/runtime/vm/profiler.cc
@@ -747,17 +747,19 @@ static bool GetAndValidateIsolateStackBounds(Thread* thread,
                                              uword* stack_lower,
                                              uword* stack_upper) {
   ASSERT(thread != NULL);
-  Isolate* isolate = thread->isolate();
-  ASSERT(isolate != NULL);
+  OSThread* os_thread = thread->os_thread();
+  ASSERT(os_thread != NULL);
   ASSERT(stack_lower != NULL);
   ASSERT(stack_upper != NULL);
 #if defined(USING_SIMULATOR)
   const bool in_dart_code = thread->IsExecutingDartCode();
   if (in_dart_code) {
+    Isolate* isolate = thread->isolate();
+    ASSERT(isolate != NULL);
     Simulator* simulator = isolate->simulator();
     *stack_lower = simulator->StackBase();
     *stack_upper = simulator->StackTop();
-  } else if (!isolate->GetProfilerStackBounds(stack_lower, stack_upper)) {
+  } else if (!os_thread->GetProfilerStackBounds(stack_lower, stack_upper)) {
     // Could not get stack boundary.
     return false;
   }
@@ -765,7 +767,7 @@ static bool GetAndValidateIsolateStackBounds(Thread* thread,
     return false;
   }
 #else
-  if (!isolate->GetProfilerStackBounds(stack_lower, stack_upper) ||
+  if (!os_thread->GetProfilerStackBounds(stack_lower, stack_upper) ||
       (*stack_lower == 0) || (*stack_upper == 0)) {
     // Could not get stack boundary.
     return false;
@@ -782,12 +784,12 @@ static bool GetAndValidateIsolateStackBounds(Thread* thread,
   }
 
   if ((sp < *stack_lower) || (sp >= *stack_upper)) {
-    // Stack pointer is outside isolate stack boundary.
+    // Stack pointer is outside thread's stack boundary.
     return false;
   }
 
   if ((fp < *stack_lower) || (fp >= *stack_upper)) {
-    // Frame pointer is outside isolate stack boundary.
+    // Frame pointer is outside threads's stack boundary.
     return false;
   }