Remove bogus DCHECK.

The code may be executed concurrently by multiple threads,
so the flag may already be set.

Test: test-art-host
bug:34074968
Change-Id: I162b90a853ce53e6b7063754bbfce5d68cffc82a
diff --git a/runtime/art_method.h b/runtime/art_method.h
index 3bc6f5d..abc304d 100644
--- a/runtime/art_method.h
+++ b/runtime/art_method.h
@@ -250,7 +250,6 @@
   }
 
   void SetSkipAccessChecks() {
-    DCHECK(!SkipAccessChecks());
     AddAccessFlags(kAccSkipAccessChecks);
   }