RFR: 8349479: C2: when a Type node becomes dead, make CFG path that uses it unreachable [v2]

[Roland Westrelin]

On Fri, 28 Mar 2025 12:45:41 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Is there anything in particular you think makes sense adding?
>
> Maybe what phase (igvn or ccp) found the dead path might be useful for diagnosis. Not sure what else would be.

New commit includes the phase in the message.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23468#discussion_r2018889926