8286103: VThreadMonitorTest fails "assert(!current->cont_fastpath() |…

…| (current->cont_fastpath_thread_state() && !interpreted_native_or_deoptimized_on_stack(current))) failed"

Reviewed-by: sspitsyn, pchilanomate

src/hotspot/share/runtime/continuationFreezeThaw.cpp

@@ -2065,6 +2065,9 @@ void ThawBase::recurse_thaw_compiled_frame(const frame& hf, frame& caller, int n
     _align_size += frame::align_wiggle; // we add one whether or not we've aligned because we add it in freeze_interpreted_frame
   }
 
+  // new_stack_frame must construct the resulting frame using hf.pc() rather than hf.raw_pc() because the frame is not
+  // yet laid out in the stack, and so the original_pc is not stored in it.
+  // As a result, f.is_deoptimized_frame() is always false and we must test hf to know if the frame is deoptimized.
   frame f = new_stack_frame<ContinuationHelper::CompiledFrame>(hf, caller, is_bottom_frame);
   intptr_t* const stack_frame_top = f.sp();
   intptr_t* const heap_frame_top = hf.unextended_sp();
@@ -2086,7 +2089,9 @@ void ThawBase::recurse_thaw_compiled_frame(const frame& hf, frame& caller, int n
 
   patch(f, caller, is_bottom_frame);
 
-  if (f.is_deoptimized_frame()) {
+  // f.is_deoptimized_frame() is always false and we must test hf.is_deoptimized_frame() (see comment above)
+  assert(!f.is_deoptimized_frame(), "");
+  if (hf.is_deoptimized_frame()) {
     maybe_set_fastpath(f.sp());
   } else if (_thread->is_interp_only_mode()
               || (_cont.is_preempted() && f.cb()->as_compiled_method()->is_marked_for_deoptimization())) {