Migrate stack resource unwinding to Thread.

runtime/vm/simulator_mips.cc

Index: runtime/vm/simulator_mips.cc
diff --git a/runtime/vm/simulator_mips.cc b/runtime/vm/simulator_mips.cc
index cd20f686ef0ccc6dd4f046d93c3a43f91171a47b..fdcdcf2ff710aac55b73bb2afaebe92c100c1f3c 100644
--- a/runtime/vm/simulator_mips.cc
+++ b/runtime/vm/simulator_mips.cc
@@ -2467,7 +2467,7 @@ void Simulator::Longjmp(uword pc,
   // Prepare for unwinding frames by destroying all the stack resources
   // in the previous C++ frames.
   Isolate* isolate = thread->isolate();
-  StackResource::Unwind(isolate);
+  StackResource::Unwind(thread);
 
   // Unwind the C++ stack and continue simulation in the target frame.
   set_pc(static_cast<int32_t>(pc));