RFR: 8358598: PhaseIterGVN::PhaseIterGVN(PhaseGVN* gvn) doesn't use its parameter [v2]

[Francesco Andreuzzi]

> As noted in the ticket, I propose a small cleanup of `PhaseIterGVN` since one of the constructors does not use its parameter.
> 
> Passes tier1 and tier2.

Francesco Andreuzzi has updated the pull request incrementally with one additional commit since the last revision:

  align with line above
  
  Co-authored-by: Manuel Hässig <manuel at haessig.org>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26617/files
  - new: https://git.openjdk.org/jdk/pull/26617/files/9ba28dc7..a5553aa0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26617&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26617&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26617.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26617/head:pull/26617

PR: https://git.openjdk.org/jdk/pull/26617