<i18n dev> RFR: 8342865: Use type parameter for Class::getPrimitiveClass

[Chen Liang]

Discovered this small cleanup while looking at wrapper class code.

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Commit messages:
 - 8342865: Use type parameter for Class::getPrimitiveClass

Changes: https://git.openjdk.org/jdk/pull/21653/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21653&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342865
  Stats: 20 lines in 10 files changed: 0 ins; 9 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/21653.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21653/head:pull/21653

PR: https://git.openjdk.org/jdk/pull/21653