[jdk23] RFR: 8334402: ProblemList test/hotspot/jtreg/compiler/c2/TestMergeStores.java on big endian platforms

[Richard Reingruber]

This PR excludes the test test/hotspot/jtreg/compiler/c2/TestMergeStores.java in jdk 23 on big endian platforms.

It fails because [JDK-8318446](https://bugs.openjdk.org/browse/JDK-8318446) is only implemented for little endian platforms in jdk 23.

[JDK-8331311](https://bugs.openjdk.org/browse/JDK-8331311) is the big endian port. It will likely not be backported to jdk 23.

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Commit messages:
 - 8334402: ProblemList test/hotspot/jtreg/compiler/c2/TestMergeStores.java on big endian platforms

Changes: https://git.openjdk.org/jdk/pull/19761/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19761&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334402
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19761.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19761/head:pull/19761

PR: https://git.openjdk.org/jdk/pull/19761