RFR: 8253179: Replace LinkedList Impl in net.http.Http2Connection [v2]

[Conor Cleary]

On Tue, 6 Oct 2020 17:04:01 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> I can sponsor this, but it is not clear what testing was done on this. At least `tier1`?

`tier1`, `tier2`, `jdk_net`, `test/jdk/java/net/httpclient` tests were conducted with all passing.

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PR: https://git.openjdk.java.net/jdk/pull/431