Move most of art::Thread to ObjPtr

Bug: 31113334

Test: test-art-host

Change-Id: I73d0de3c875d3ec3d732034fdc961dae79ef4070
diff --git a/runtime/quick_exception_handler.cc b/runtime/quick_exception_handler.cc
index a81458f..b809c3e 100644
--- a/runtime/quick_exception_handler.cc
+++ b/runtime/quick_exception_handler.cc
@@ -140,7 +140,7 @@
   DISALLOW_COPY_AND_ASSIGN(CatchBlockStackVisitor);
 };
 
-void QuickExceptionHandler::FindCatch(mirror::Throwable* exception) {
+void QuickExceptionHandler::FindCatch(ObjPtr<mirror::Throwable> exception) {
   DCHECK(!is_deoptimization_);
   if (kDebugExceptionDelivery) {
     mirror::String* msg = exception->GetDetailMessage();