ART: Introduce NO_RETURN, Mark DoLongJump noreturn

Add NO_RETURN macro that adds C++11 noreturn attribute. Mark
DoLongJump methods as noreturn.

Change-Id: Ifde4318e370493237050d4c1349285a0382df23f
diff --git a/runtime/quick_exception_handler.cc b/runtime/quick_exception_handler.cc
index 85ec803..7bdf652 100644
--- a/runtime/quick_exception_handler.cc
+++ b/runtime/quick_exception_handler.cc
@@ -353,6 +353,7 @@
   context_->SetPC(handler_quick_frame_pc_);
   context_->SmashCallerSaves();
   context_->DoLongJump();
+  UNREACHABLE();
 }
 
 }  // namespace art