Add packageName to instantiation exception log.

So we can figure out what package we failed to instantiate an app class
for.

Bug: 174771490
Test: N/A
Change-Id: I554138375ede9421ba053547bbc0250f3b2e812a

core/java/android/app/LoadedApk.java

@@ -1284,7 +1284,7 @@ public final class LoadedApk {
                 Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                 throw new RuntimeException(
                     "Unable to instantiate application " + appClass
-                    + ": " + e.toString(), e);
+                    + " package " + mPackageName + ": " + e.toString(), e);
             }
         }
         mActivityThread.mAllApplications.add(app);