Enable redefining Bootclasspath classes

Test: mma -j40 test-art-host
Change-Id: I84fff0b428fbaeaba003269614310fdab576bcd6
diff --git a/runtime/openjdkjvmti/ti_redefine.h b/runtime/openjdkjvmti/ti_redefine.h
index 85df6e1..4492db0 100644
--- a/runtime/openjdkjvmti/ti_redefine.h
+++ b/runtime/openjdkjvmti/ti_redefine.h
@@ -127,6 +127,10 @@
     art::mirror::Class* GetMirrorClass() REQUIRES_SHARED(art::Locks::mutator_lock_);
     art::mirror::ClassLoader* GetClassLoader() REQUIRES_SHARED(art::Locks::mutator_lock_);
 
+    const art::DexFile& GetDexFile() {
+      return *dex_file_;
+    }
+
     art::mirror::DexCache* CreateNewDexCache(art::Handle<art::mirror::ClassLoader> loader)
         REQUIRES_SHARED(art::Locks::mutator_lock_);