Update texure cache after teleting bound texture. The texture cache could become out of sync. And we could end up dereferencing an invalid pointer. Bug: chromium:943538 Change-Id: I6a99a04e80fc551b6177e25b7bee09c6ae226340 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1541718 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>