RFR: 8254269: simplify Node::disconnect_inputs [v2]

[Vladimir Kozlov]

On Sun, 11 Oct 2020 08:08:18 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> 8254269: simplify Node::disconnect_inputs
>
> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8254269: simplify Node::disconnect_inputs
>   
>   Optimize it for the precedence loop. because there's no null between
>   2 non-null precedences, disconnect_inputs can break at a null value.

Changes requested by kvn (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/589