[lworld] RFR: 8368523: [lworld] fix testlibrary_tests/ir_framework/tests/TestPhaseIRMatching.java after jdk-26+7 merge

[Marc Chevalier]

Details of how we ended up there are in the JBS issue.

Let's take the mainline version and put it in valhalla... Except that the mainline version doesn't need (and doesn't have) the `loadee` and `storee` parameters, but have the value `IS_REPLACED` for those. It's unfortunate since conflicts may happen again. Should be less bad.

It now passes the tests of `testlibrary_tests/ir_framework/tests/TestPhaseIRMatching.java` again.

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Commit messages:
 - Better load/store regexes

Changes: https://git.openjdk.org/valhalla/pull/1639/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1639&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368523
  Stats: 16 lines in 1 file changed: 12 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/1639.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1639/head:pull/1639

PR: https://git.openjdk.org/valhalla/pull/1639