RFR: 8310727: C2: *_of() methods in PhaseIterGVN should use uint for the node index

[Tobias Hartmann]

On Wed, 27 Sep 2023 13:51:36 GMT, Daniel Lundén <duke at openjdk.org> wrote:

> This changeset addresses the below.
>> Some *_of() methods in PhaseIterGVN like replace_input_of() use int instead of uint for the node index. We should change that.
> 
> ### Testing (on all Oracle-supported platforms)
> - `tier1` 
> - HotSpot parts of `tier2` and `tier3`

Looks good to me.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15946#pullrequestreview-1664147760