[jdk21] RFR: 8310425: [JVMCI] compiler/runtime/TestConstantDynamic: lookupConstant returned an object of incorrect type: null

[Tobias Hartmann]

Backport of [JDK-8310425](https://bugs.openjdk.java.net/browse/JDK-8310425). Applies cleanly.

Thanks,
Tobias

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Commit messages:
 - 8310425: [JVMCI] compiler/runtime/TestConstantDynamic: lookupConstant returned an object of incorrect type: null

Changes: https://git.openjdk.org/jdk21/pull/101/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=101&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310425
  Stats: 14 lines in 2 files changed: 10 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21/pull/101.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/101/head:pull/101

PR: https://git.openjdk.org/jdk21/pull/101