Revert "Revert "Support class unloading in dex2oat for quicken multidex""

Bug: 63467744
Test: test-art-host

This reverts commit 6921d90a241f0307ac25120f8f976744d4a57706.

Change-Id: If70e31d3a15579dc75fd40bfef186e0124568c87
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index d9886a2..ba4581c 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -377,6 +377,8 @@
     return profile_compilation_info_;
   }
 
+  bool CanAssumeVerified(ClassReference ref) const;
+
  private:
   void PreCompile(jobject class_loader,
                   const std::vector<const DexFile*>& dex_files,