RFR: 8265375: Bootcycle builds fail with StackOverflowError in cldrconverter

[Naoto Sato]

Please review the fix to the tier4 build failure. The piece of code that made into `CLDRLocaleProviderAdapter.java` was also needed in the build tool counterpart (`CLDRConverter`).

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Commit messages:
 - 8265375: Bootcycle builds fail with StackOverflowError in cldrconverter

Changes: https://git.openjdk.java.net/jdk/pull/3553/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3553&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265375
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3553.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3553/head:pull/3553

PR: https://git.openjdk.java.net/jdk/pull/3553