[jdk17u-dev] RFR: 8295066: Folding of loads is broken in C2 after JDK-8242115

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

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

Depends on: https://git.openjdk.org/jdk17u-dev/pull/999

Commit messages:
 - Add forgotten test
 - Backport 58a7141a0dea5d1b4bfe6d56a95d860c854b3461

Changes: https://git.openjdk.org/jdk17u-dev/pull/1001/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1001&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295066
  Stats: 260 lines in 9 files changed: 178 ins; 46 del; 36 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1001.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1001/head:pull/1001

PR: https://git.openjdk.org/jdk17u-dev/pull/1001