[jdk17u-dev] RFR: 8296912: C2: CreateExNode::Identity fails with assert(i < _max) failed: oob: i=1, _max=1

[Goetz Lindenmaier]

backport this for parity with 17.0.7-oracle.

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

Commit messages:
 - Backport 502fa3eeea849cfcc50436602be1654695ef4e26

Changes: https://git.openjdk.org/jdk17u-dev/pull/1029/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1029&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296912
  Stats: 30 lines in 2 files changed: 23 ins; 1 del; 6 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1029.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1029/head:pull/1029

PR: https://git.openjdk.org/jdk17u-dev/pull/1029