Validate input of JNI::NewStringUTF(). am: 7dd48b90bd am: a9780402b4 am: b9997cd03e

Original change: https://googleplex-android-review.googlesource.com/c/platform/art/+/13146018

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I9bcc28a8e3756f0aefeb38d4fb61f05c01d408c7