RFR: 8309104: [JVMCI] compiler/unsafe/UnsafeGetStableArrayElement test asserts wrong values with Graal

[David Leopoldseder]

This PR fixes the UnsafeGetStableArrayElement test when run with the Graal compiler.

In the past this test also failed with graal because it was checking for c1/c2 semantics.
JDK-8264135 introduced changes to the UnsafeGetStableArrayElement test to account for the scenario when the test is run with the Graal compiler. If Graal is used it will assert that constants are folded by asserting matching instead of mismatch.

However, we had changes in Graal since then, since JDK-8275645 Graal no longer constant folds unaligned reads.
This lets the test fail again for the unaligned cases because it asserts graal folds them.

The fix is to actually assert mismatch on unaligned accesses.

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Commit messages:
 - 8309104: [JVMCI] compiler/unsafe/UnsafeGetStableArrayElement test asserts wrong

Changes: https://git.openjdk.org/jdk/pull/14242/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14242&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309104
  Stats: 13 lines in 1 file changed: 0 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/14242.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14242/head:pull/14242

PR: https://git.openjdk.org/jdk/pull/14242