[jdk11u-dev] RFR: 8276306: jdk/jshell/CustomInputToolBuilder.java fails intermittently on storage acquisition

[Martin Doerr]

Clean backport of [JDK-8276306](https://bugs.openjdk.java.net/browse/JDK-8276306).

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Commit messages:
 - Backport 75adf54bdcc5e06fb8e8ca499a2f326d70b65f76

Changes: https://git.openjdk.org/jdk11u-dev/pull/2794/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2794&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8276306
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2794.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2794/head:pull/2794

PR: https://git.openjdk.org/jdk11u-dev/pull/2794