[code-reflection] RFR: Captured constants in variables

[Paul Sandoz]

Tweak the modeling of captured constants to model as variables initialized with the constants. This makes the modeling more uniform and preserves the variable name. Which in turn fixes an issue in HAT that relies on this uniformity.

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Commit messages:
 - Captured constants in variables

Changes: https://git.openjdk.org/babylon/pull/250/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=250&range=00
  Stats: 9 lines in 3 files changed: 2 ins; 1 del; 6 mod
  Patch: https://git.openjdk.org/babylon/pull/250.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/250/head:pull/250

PR: https://git.openjdk.org/babylon/pull/250