[jdk21u] RFR: 8313402: C1: Incorrect LoadIndexed value numbering

[Aleksey Shipilev]

Clean backport to fix the important C1 bug.

Additional testing:
 - [x] New regression test fails without the patch, passes with it
 - [ ] Linux AArch64 `fastdebug` `tier1 tier2 tier3`

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Commit messages:
 - Backport 46fbedb2be98a9b8aba042fa9f90c3b25c312cd6

Changes: https://git.openjdk.org/jdk21u/pull/37/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=37&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313402
  Stats: 59 lines in 2 files changed: 58 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/37.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/37/head:pull/37

PR: https://git.openjdk.org/jdk21u/pull/37