[jdk26] RFR: 8354282: C2: more crashes in compiled code because of dependency on removed range check CastIIs [v2]

[Roland Westrelin]

> Hi all,
> 
> This pull request contains a backport of commit [00068a80](https://github.com/openjdk/jdk/commit/00068a80304a809297d0df8698850861e9a1c5e9) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Roland Westrelin on 10 Dec 2025 and was reviewed by Christian Hagedorn, Quan Anh Mai, Galder Zamarreño and Emanuel Peter.
> 
> Thanks!

Roland Westrelin has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'jdk26' into backport-rwestrel-00068a80-jdk26
 - Backport 00068a80304a809297d0df8698850861e9a1c5e9

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28892/files
  - new: https://git.openjdk.org/jdk/pull/28892/files/ceb2ac15..4121d277

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28892&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28892&range=00-01

  Stats: 1087 lines in 32 files changed: 746 ins; 238 del; 103 mod
  Patch: https://git.openjdk.org/jdk/pull/28892.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28892/head:pull/28892

PR: https://git.openjdk.org/jdk/pull/28892