Fix small art build.

Change-Id: Idaade55babbab192c87b32c077d2ec01ac9ef0e2
diff --git a/runtime/verifier/method_verifier.cc b/runtime/verifier/method_verifier.cc
index dcc9f90..cc0559d 100644
--- a/runtime/verifier/method_verifier.cc
+++ b/runtime/verifier/method_verifier.cc
@@ -4095,10 +4095,13 @@
   DCHECK(Runtime::Current()->IsCompiler());
   ReaderMutexLock mu(Thread::Current(), *dex_gc_maps_lock_);
   DexGcMapTable::const_iterator it = dex_gc_maps_->find(ref);
-  CHECK(it != dex_gc_maps_->end())
-    << "Didn't find GC map for: " << PrettyMethod(ref.dex_method_index, *ref.dex_file);
-  CHECK(it->second != NULL);
-  return it->second;
+  if (it == dex_gc_maps_->end()) {
+    LOG(WARNING) << "Didn't find GC map for: " << PrettyMethod(ref.dex_method_index, *ref.dex_file);
+    return NULL;
+  } else {
+    CHECK(it->second != NULL);
+    return it->second;
+  }
 }
 
 void  MethodVerifier::SetDevirtMap(MethodReference ref,