RFR: 8253586: C2: Clean up unused PhaseIterGVN::init_worklist()

[Roberto Castaneda Lozano]

On Thu, 24 Sep 2020 11:07:40 GMT, Roberto Castaneda Lozano <github.com+8792647+robcasloz at openjdk.org> wrote:

>> Remove unused method `PhaseIterGVN::init_worklist(Node *)`.
>
> Tested on `hs-tier1`.

Remove unused method PhaseIterGVN::init_worklist(Node *).

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PR: https://git.openjdk.java.net/jdk/pull/334