[jdk11u-dev] RFR: 8219612: [TESTBUG] compiler.codecache.stress.Helper.TestCaseImpl can't be defined in different runtime package as its nest host

[Andrew Lu]

I backport this for parity with 11.0.23-oracle.

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Commit messages:
 - Backport 3f0955154dd0e306f1ed1cbc8e9415963a5b1edc

Changes: https://git.openjdk.org/jdk11u-dev/pull/2328/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2328&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8219612
  Stats: 89 lines in 5 files changed: 55 ins; 30 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2328.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2328/head:pull/2328

PR: https://git.openjdk.org/jdk11u-dev/pull/2328