debug hint for missing JNI method am: c095a839c6

Original change: https://android-review.googlesource.com/c/platform/art/+/2308544

Change-Id: I9182ec5addb88c3359a1465e1c848c2287cdab6d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/runtime/jni/java_vm_ext.cc b/runtime/jni/java_vm_ext.cc
index f28532b..44ff6eb 100644
--- a/runtime/jni/java_vm_ext.cc
+++ b/runtime/jni/java_vm_ext.cc
@@ -306,6 +306,7 @@
       *detail += "No implementation found for ";
       *detail += m->PrettyMethod();
       *detail += " (tried " + jni_short_name + " and " + jni_long_name + ")";
+      *detail += " - is the library loaded, e.g. System.loadLibrary?";
     }
     return nullptr;
   }