[code-reflection] RFR: Support conversions of primitives in testing context

[Mourad Abbay]

Support conversions of primitives in testing context.

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Commit messages:
 - Support conversions of primitives in testing context

Changes: https://git.openjdk.org/babylon/pull/265/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=265&range=00
  Stats: 165 lines in 2 files changed: 147 ins; 9 del; 9 mod
  Patch: https://git.openjdk.org/babylon/pull/265.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/265/head:pull/265

PR: https://git.openjdk.org/babylon/pull/265