Plasma reference counting not properly done in TensorFlow custom operator.

[asfimport]

We never call Release in the custom op code.

Reporter: Robert Nishihara / @robertnishihara
Assignee: Robert Nishihara / @robertnishihara

PRs and other links:

• GitHub Pull Request #3061

_{Note: This issue was originally created as ARROW-3920. Please see the migration documentation for further details.}

[asfimport]

Philipp Moritz / @pcmoritz:
Issue resolved by pull request 3061
#3061