Bug fixes for hot reload

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index 5c219ccb154c934041f5477051d9977863f5db82..701579cd8793aa95f34f485038fc9ac3529f791a 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -255,7 +255,6 @@ class Isolate : public BaseIsolate {
   void DoneLoading();
   void DoneFinalizing();
 
-  void OnStackReload();
   void ReloadSources(bool test_mode = false);
 
   bool MakeRunnable();
@@ -532,6 +531,9 @@ class Isolate : public BaseIsolate {
   RawError* sticky_error() const { return sticky_error_; }
   void clear_sticky_error();
 
+  RawError* sticky_reload_error() const { return sticky_reload_error_; }
+  void clear_sticky_reload_error();
+
   bool compilation_allowed() const { return compilation_allowed_; }
   void set_compilation_allowed(bool allowed) {
     compilation_allowed_ = allowed;
@@ -751,6 +753,8 @@ class Isolate : public BaseIsolate {
 
   RawError* sticky_error_;
 
+  RawError* sticky_reload_error_;
+
   // Background compilation.
   BackgroundCompiler* background_compiler_;
   intptr_t background_compiler_disabled_depth_;