[jdk21u-dev] RFR: 8353713: Improve Currency.getInstance exception handling

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle.

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Commit messages:
 - Backport 5cac579619164b9a664327a4f71c4de7e7575276

Changes: https://git.openjdk.org/jdk21u-dev/pull/1970/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1970&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353713
  Stats: 37 lines in 2 files changed: 12 ins; 0 del; 25 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1970.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1970/head:pull/1970

PR: https://git.openjdk.org/jdk21u-dev/pull/1970