[jdk24u] RFR: 8358066: Non-ascii package names gives compilation error "import requires canonical name"

[Archie Cobbs]

This pull request contains a backport of commit [09ec4de7](https://github.com/openjdk/jdk/commit/09ec4de74d495560ffb9ec529df7ec818c1d617c) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

This fixes a bug which causes some `import` statements containing non-ASCII class names to fail.

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Commit messages:
 - Backport 09ec4de74d495560ffb9ec529df7ec818c1d617c

Changes: https://git.openjdk.org/jdk24u/pull/232/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk24u&pr=232&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358066
  Stats: 75 lines in 2 files changed: 70 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk24u/pull/232.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/232/head:pull/232

PR: https://git.openjdk.org/jdk24u/pull/232