RFR: 8340585: [JVMCI] compiler/unsafe/UnsafeGetStableArrayElement.java fails with -XX:-UseCompressedClassPointers

[Yudi Zheng]

Graal does not constant fold unaligned long/double reads from primitive stable arrays. Update UnsafeGetStableArrayElement.java accordingly.

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Commit messages:
 - compiler/unsafe/UnsafeGetStableArrayElement.java fails with -XX:-UseCompressedClassPointers

Changes: https://git.openjdk.org/jdk/pull/21136/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21136&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340585
  Stats: 12 lines in 1 file changed: 0 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/21136.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21136/head:pull/21136

PR: https://git.openjdk.org/jdk/pull/21136