Handle new zygote flags in ART

Add support for DISABLE_VERIFIER and ONLY_USE_SYSTEM_OAT_FILES.

bug: 30972906
bug: 63920015

Test: device boots
Change-Id: I7c4eddc070908aed980d54d374c0b261d1f32d57
diff --git a/runtime/runtime.h b/runtime/runtime.h
index 2eb4411..399e1c1 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -514,6 +514,7 @@
     return !implicit_so_checks_;
   }
 
+  void DisableVerifier();
   bool IsVerificationEnabled() const;
   bool IsVerificationSoftFail() const;