Add some debugging for zygote crash.

bug:27340451

(cherry picked from commit de166544d6539942d3507ce47910f601c97b7532)

Change-Id: Ie4400064d81e260b41bd1408a9ed54be8ca0479e
diff --git a/runtime/art_method.cc b/runtime/art_method.cc
index cd38e16..243fdf8 100644
--- a/runtime/art_method.cc
+++ b/runtime/art_method.cc
@@ -377,7 +377,7 @@
 
   Runtime* runtime = Runtime::Current();
   const void* existing_entry_point = GetEntryPointFromQuickCompiledCode();
-  DCHECK(existing_entry_point != nullptr);
+  CHECK(existing_entry_point != nullptr) << PrettyMethod(this) << "@" << this;
   ClassLinker* class_linker = runtime->GetClassLinker();
 
   if (class_linker->IsQuickGenericJniStub(existing_entry_point)) {