Prevent verified method from being deleted by compiler driver.

The results of it will be needed by future optimizing compiler changes.

Change-Id: Ifbdf47e7564906b74193f80a4ba0459eed87c0f7
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index efcaae4..edd1bd2 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -557,6 +557,7 @@
   DexFileToMethodInlinerMap* const method_inliner_map_;
 
   std::unique_ptr<Compiler> compiler_;
+  Compiler::Kind compiler_kind_;
 
   const InstructionSet instruction_set_;
   const InstructionSetFeatures* const instruction_set_features_;