Integrated: Remove _keepalive WeakHandle remnants.

[Coleen Phillimore]

On Mon, 10 May 2021 12:37:25 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Since I went down the path of looking at _keepalive and found that the code for it was removed, I think the rest of it should be also.
> Tested with loom-tier1, 2.

This pull request has now been integrated.

Changeset: 42881d1e
Author:    Coleen Phillimore <coleenp at openjdk.org>
Committer: Ron Pressler <rpressler at openjdk.org>
URL:       https://git.openjdk.java.net/loom/commit/42881d1e1a772449bce9de05c4778a53f2b81545
Stats:     81 lines in 15 files changed: 0 ins; 47 del; 34 mod

Remove _keepalive WeakHandle remnants.

Reviewed-by: eosterlund

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PR: https://git.openjdk.java.net/loom/pull/41