Add some logging for diagnosing a crash.

Test: m
Bug: 160292234
Change-Id: I578f7b64b4f78ff32d1a4e17ea0570d351ff4980
diff --git a/runtime/class_linker-inl.h b/runtime/class_linker-inl.h
index 2732de5..15a787b 100644
--- a/runtime/class_linker-inl.h
+++ b/runtime/class_linker-inl.h
@@ -279,7 +279,7 @@
         const dex::MethodId& method_id = dex_cache->GetDexFile()->GetMethodId(method_idx);
         ObjPtr<mirror::Class> klass =
             LookupResolvedType(method_id.class_idx_, dex_cache, class_loader);
-        DCHECK(klass != nullptr);
+        DCHECK(klass != nullptr) << dex_cache->GetDexFile()->PrettyMethod(method_idx);
         return klass;
       });
 }