RFR: [type-classes] 8377095: Update basic tests for UnsignedInt to use lambdas

[Joe Darcy]

With a recent javac code generation fix, update the UnsignedInt class to use lambdas.

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Commit messages:
 - 8377095: Update basic tests for UnsignedInt to use lambdas

Changes: https://git.openjdk.org/valhalla/pull/2024/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2024&range=00
  Stats: 27 lines in 2 files changed: 3 ins; 21 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/2024.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2024/head:pull/2024

PR: https://git.openjdk.org/valhalla/pull/2024