RFR: 8263705: Two shenandoah tests fails due to can't find ClassFileInstaller

[Jie Fu]

Hi all,

gc/shenandoah/TestReferenceRefersToShenandoah.java and gc/shenandoah/TestReferenceShortcutCycle.java fail due to can't find ClassFileInstaller.
Let's fix it.

Thanks.
Best regards,
Jie

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Commit messages:
 - 8263705: Two shenandoah tests fails due to can't find ClassFileInstaller

Changes: https://git.openjdk.java.net/jdk/pull/3039/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3039&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263705
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3039.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3039/head:pull/3039

PR: https://git.openjdk.java.net/jdk/pull/3039